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Anonymous 08/26/14(Tue)22:40 UTC+1 No.10964733 Report

Lets bicker about oil change intervals for a bit.

Lately, my thought has been that I should just go with the what the owner's manual says and call it a day, but I wonder if the mileage vs length of time, which ever comes first, is a bit excessive.

According to my Nissan manual, if I go by the #1 schedule because of my typically <5mi driving, I should change the oil every 3,750mi or 3 months, whichever comes first.

3 months seems a bit much, and I never drive 3,750 mi in that time period.

The #2 schedule recommends the change every 7,500mi or 6 months.

I've just put conventional oil in my '98 Altima so far. I changed it when I first got it at 91k, then 3 months in at 93k or 94k. I'm now at 96k I think and it's been 4.5months.

I have no desire to keep this car to 200k...not even 150k, but I'd like to take maintain it regardless.
Anonymous 08/26/14(Tue)23:24 UTC+1 No.10964935 Report

Engine is probably one of the lesser things you ought to worry about. A lot of people do twice yearly and have no complaints when they do a limited amount of driving. Personally, I change my oil every 3,000 miles and do the filter as well.

98 Altima? Watch our for sub frame and core supports rotting away. They like to do that kind of thing.
Anonymous 08/26/14(Tue)23:28 UTC+1 No.10964954 Report

My mechanic just reccomended an oil change at the pub the other day.

How would I go about such a thing? Just unscrew a cap on the bottom, wait for it to drain then add new stuff right?
Anonymous 08/26/14(Tue)23:32 UTC+1 No.10964967 Report

Don't forget to replace the drain plug and change the filter.
Anonymous 08/26/14(Tue)23:48 UTC+1 No.10965040 Report

I looked it up quickly, and it's a rust issue right? Seems simply enough to look over, though Imagine it should be well off since the car is from Los Angeles, CA.
Anonymous 08/26/14(Tue)23:49 UTC+1 No.10965048 Report

I follow whatever the manufacturer recommends to the letter and don't give a fuck beyond that.
Anonymous 08/26/14(Tue)23:49 UTC+1 No.10965053 Report

This. The engineers know more than you do, OP.
Anonymous 08/26/14(Tue)23:53 UTC+1 No.10965069 Report

This has been my mind set so far. Only recently I began to question it.
Anonymous 08/27/14(Wed)00:05 UTC+1 No.10965121 Report

In the salt states they sure do. Wasn't aware where you were from or where the car originated.
At Work 08/27/14(Wed)00:09 UTC+1 No.10965145 Report

> my thought has been that I should just go with the what the owner's manual says

Answered your own question.
Anonymous 08/27/14(Wed)00:09 UTC+1 No.10965147 Report

Oil quality has improved over the years, doing changes every 3k nowadays is excessive. (especially for benchracers) You should be safe if you do it once per year/10k miles.
At Work 08/27/14(Wed)00:10 UTC+1 No.10965154 Report


Why would you question people who know more than you? I'm genuinely curious.
Anonymous 08/27/14(Wed)00:15 UTC+1 No.10965181 Report

They do. But as an engineer, let me clue you in so you can make an educated choice, rather than a choice based on the manufacturer hedging their bets on the safest end of things to avoid a law suit.

You change oil because of viscous shear and additive depletion. Viscous shear is the petrochemical chains being ripped apart (these are why oil is viscous) by mechanical activity assisted by temperature. Additive depletion is the various trade secret chemicals dumped into the oil to improve adhesion, remove rust, pull out water, whatever. They are chemicals and they eventually saturate.

So the point here is mileage matter the most in terms of viscosity destruction, and time in terms of additive effectiveness. Frequent starts and stops matter because the additive effectiveness of adhesion is critical in that specific case to avoid premature wear from raw parts contacting.
Anonymous 08/27/14(Wed)00:19 UTC+1 No.10965201 Report

Everyone suddenly treats the owner's manual like the bible? Most seem to think the recommended intervals are bs and don't trust them whether they choose to go for shorter or longer intervals.

That is why I've questioned the 3 month interval.
At Work 08/27/14(Wed)00:21 UTC+1 No.10965220 Report


They're designed by people who understand how the engine is made. It would be like someone working as a secretary questioning an engineer about whether they knew how to make the building they work in. Follow the intervals outlined by the owners manual because at the least, you won't be causing any issues, at the worst, you're wasting an extra $40 a year. Most newer cars don't even follow the 3k mile/3 month thing anymore. One of my cars is scheduled for 6k miles, the other just states don't go over 10k miles.
Mama Miata 08/27/14(Wed)00:46 UTC+1 No.10965397 Report

I change my full synthetic oil every 1000 miles.

Mainly because it burns oil so fast.
Anonymous 08/27/14(Wed)00:51 UTC+1 No.10965439 Report

I'm aware of how oil works, but unless you have the resources and knowledge to test these properties you should just listen to what the manufacturer says.
Anonymous 08/27/14(Wed)00:59 UTC+1 No.10965516 Report


Just check your dipstick every week or so and check for sludge/dirty oil. If that shit is pitch black, change it.
Anonymous 08/27/14(Wed)01:09 UTC+1 No.10965605 Report

But I do know better than the lawyers and accountants that actually write this shit.
Anonymous 08/27/14(Wed)01:15 UTC+1 No.10965657 Report

You assume the engineers get more say than the accountants and actuaries.
Anonymous 08/27/14(Wed)01:20 UTC+1 No.10965701 Report

My truck is in a constant state of oil change. I'll never get around to fixing that oil pan gasket.
Anonymous 08/27/14(Wed)01:21 UTC+1 No.10965710 Report

>oil on stick is clear
>comes out dark brown
[PLEBSPOTTERS] wat 08/27/14(Wed)01:34 UTC+1 No.10965813 Report

When my car oil change light comes on, around 7k miles.
2000 honda accord.

For the miata, every 4k because the old ass dirty lifters start to tick.

For the 22r yota, every 4-5k due to dusty desert conditions and older valvetrain that does not have roller surfaces.
Inu 08/27/14(Wed)01:36 UTC+1 No.10965823 Report

i have full synthetic and a matching oil filter and i go every 10k miles
1987 Toyota MR2 AW11 08/27/14(Wed)01:42 UTC+1 No.10965871 Report

>the government and big business know whats best for me!
Anonymous 08/27/14(Wed)01:42 UTC+1 No.10965872 Report

>doing oil changes
>not just letting the old oil burn off and putting new oil in as needed.
>ITT plebs
Anonymous 08/27/14(Wed)01:43 UTC+1 No.10965878 Report

>mfw I know someone that actually does this
Anonymous 08/27/14(Wed)01:46 UTC+1 No.10965905 Report

I did this with break fluid recently because I can't use jack stands at home.

Hold me /o/.
Anonymous 08/27/14(Wed)01:47 UTC+1 No.10965915 Report

If your car is shitty enough to burn that much and you still change the filter regularly, it isn't that much worse. Plus if your car is burning that much oil its already a shitbox, not much more damage you can do.
Anonymous 08/27/14(Wed)01:47 UTC+1 No.10965916 Report

>that cloud of smoke on start up in the morning
>that short lived buzz you get from the rich exhaust
>tfw you buy gallons of oil when grocery shopping at walmart
>tfw you walk by the new gaskets and carb rebuilt kit in the garage you never intend to use
Anonymous 08/27/14(Wed)01:48 UTC+1 No.10965922 Report

your brake fluid doesn't burn off.
Anonymous 08/27/14(Wed)01:49 UTC+1 No.10965929 Report

Considering they have no choice but to listen to the engineers, I would say no.
Anonymous 08/27/14(Wed)01:50 UTC+1 No.10965939 Report

>brake lines routed through exhaust manifolds
Anonymous 08/27/14(Wed)01:55 UTC+1 No.10965974 Report

I do every 5000 miles because it is easy to remember. at X0,000 or X5,000 you need an oil change.

This works out to be about 30% oil life left based on the oil change reminder built into the car.

The car I put less than 5000 miles a year on I only change once a year.
Anonymous 08/27/14(Wed)01:58 UTC+1 No.10966007 Report

I drive about 450 miles a week, and demand a bit much of my engine. But she gets full synth and a new filter every 3,000 miles, no exception. Local Autozone usually has a 5.3qt jug of Mobil1 and a Bosch filter for <$35, and it's like a 15 minute job. I realize that some people don't have the time or money, but maintaining a healthy oil service schedule is a helluva lot cheaper and easier than replacing an engine.

Engine's an early-build VQ35DE (2003), which are prone to burning oil. Had the car 2.5 years now and haven't seen the oil level drop a hair yet. Keeping your fluids fresh and clean will do wonders.
Anonymous 08/27/14(Wed)01:59 UTC+1 No.10966016 Report

oil quality has improved but the rating system hasn't changed and is outdated. Every single car made in the past 10 years requires a better quality oil than the API/SAE tests provide.

follow the owners manual and use the correct rated oil for the car.
Anonymous 08/27/14(Wed)02:00 UTC+1 No.10966024 Report

My owners manual says to use leaded if available
Anonymous 08/27/14(Wed)02:00 UTC+1 No.10966025 Report

So then it was a leak?

Welp. The entire system needs to be replaced anyway, but it's not like the car is worth the 1k to replace all the brakes.
Anonymous 08/27/14(Wed)02:02 UTC+1 No.10966050 Report

Used oil analysis will tell you how long you can really go
Anonymous 08/27/14(Wed)02:02 UTC+1 No.10966052 Report

>1k to replace all the brakes.
a weekend and $300 bucks should be more than enough. just buy everything at rockauto. faglord.
Anonymous 08/27/14(Wed)02:06 UTC+1 No.10966083 Report

just read your owners manual. It should explain how to do it specifically for your car. Maybe even a picture.
Anonymous 08/27/14(Wed)02:09 UTC+1 No.10966105 Report

Did you read the part where I can't use jack stands at home?
Anonymous 08/27/14(Wed)02:10 UTC+1 No.10966127 Report

You forgot a few steps

>unscrew drain plug
>misjudged how far the stream would go
>realign drain pain and go fetch kitty litter
>drain pain not big enough
>pouring everywhere
>out of kitty litter
>try to mop it up
>it just spreads
>cover area in gravel and hope landlord doesn't notice
1987 Toyota MR2 AW11 08/27/14(Wed)02:15 UTC+1 No.10966159 Report

>not just changing your oil on the street and just letting it fall on the asphalt.
Anonymous 08/27/14(Wed)02:21 UTC+1 No.10966223 Report

>because of my typically <5mi driving
although it may not seem it, this is a rather severe duty cycle. Your oil most likely isn't getting time to burn off moisture and get up to operating temp.
>I should change the oil every 3,750mi or 3 months, whichever comes first.
yes, especially if it has forced induction or is a delicate flower (bmw).
Anonymous 08/27/14(Wed)02:35 UTC+1 No.10966363 Report

My commute is about 5 miles but there's 2 straights of 1.5 miles and 2 miles with no lights and I'm always at operating temperature well before I get to work. Am I fugged?
Anonymous 08/27/14(Wed)02:42 UTC+1 No.10966417 Report

I would still stick with the more severe service recommendation.

oh.. and get a bicycle.
Anonymous 08/27/14(Wed)02:48 UTC+1 No.10966465 Report

It's only 5 miles but my work is about 150 feet lower than my house.
Anonymous 08/27/14(Wed)10:17 UTC+1 No.10968992 Report

>drive old diesel truck
>owners manual says 5k
>run properly rated synthetic oil 25k or 1 year
>do oil analysis to keep eye on things
>gone as long as 2.5years on a single oil change
>307k+ miles and runs like new.
>saved thousands in maintenance costs.

>>>but engineers know more than you

>not keeping in mind most, if not all owners manuals, say to run house brand oil.
That's how they get'chya!
Anonymous 08/27/14(Wed)10:20 UTC+1 No.10969005 Report

You should definitely get a bike. Release all your pent-up work rage on the hill on the way home.

Does wonders for your relationships.
ColoradoTwisties 08/27/14(Wed)10:26 UTC+1 No.10969016 Report

Got a question for you all. I have a weekend warrior CRX that has only driven 1,600 miles this year but it's been just over 6 months since the oil change. Should I change it or hold off until more miles are hit? It's Mobil 1 full synthetic.
>>pic unrelated
Anonymous 08/27/14(Wed)10:30 UTC+1 No.10969042 Report

change it
Anonymous 08/27/14(Wed)16:55 UTC+1 No.10970009 Report

I change my oil every couple of months, because it just leaks out/burns at that rate. Keep topping that shit up.
Filters every 5-10k, depending on how shitty the oil gets.
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