Har-ray

The service dept. at my dealer told me to take car in for 1st oil change when oil life monitor is at 30%. Any thoughts? What have you done? '17 Stingray

MikeyTX

Dry Sump or wet ? Dry is at 500 miles.

c8nukeZ51

If it's a Z-51 then go in at 500 miles. Not sure what percent that is.

Har-ray

Wet. 4600 mi. At 36% now.

Rooster OG

It can't hurt but that's silly. I bring mine in around 10%.

thill444

What are the weather conditions where you live, and how hard do you drive your car?

This is just me, but if you live in climates with extreme temperatures I recommend changing the oil more often, and if you drive the car hard I recommend changing the oil more often. I have been living by this rule for years and never had oil/engine issues with any of my cars.

You can always send your oil off for analysis to see how it looks.

Patman

If you drive your car hard the oil life monitor will compensate for this and will count down to zero faster, so there is no need to change the oil any sooner (for example, just because you drive hard doesn't mean you should be changing the oil at 50% oil life, you should still wait until it gets down below 10% because that harder driving will get you to that point at a lower mileage than someone who drives gently)

walleyejack

wet sump and did mine at 500 miles. dealer covered it and 3 more

Frodo

I changed my wet sump oil at 500 miles. I know the factory doesn't recommend that as they do dry sump engines but I've always felt its best to get the original oil out as soon as break-in is complete. There may possibly be contaminates in there. I call it cheap insurance against the unknown and unknowable. Just sayin.

BTW, I change my own oil, don't care that they're giving it away. Unlikely a Corvette mechanic is doing it and I'm not letting some kid grease monkey touch my car. Especially after reading the horror stories of dealers overfilling the engine.

Har-ray

Tthank you. That is exactly what I thought

JerryU

The OLM algorithm is very complex. It does not go by miles! It does use engine RPM, number of starts, how hot the oil gets after starting etc. The C7, for the first time also uses a calendar and does what it has said for years for my other Vettes, "change when the OLM approaches 0 OR 1 year which even comes 1st." So now,even if you don't drive much it will it will clock down to 0 with time and be at 0 in one year. Those who store their car in the Winter will see the % reduce after you start up in the Spring!

The worse thing for an engine is starting and the next not getting the oil hot for long enough to burn off the water and other blow-by that passes the rings when the engine is cold. So for short, 2 mile trips to the store it will count down to 0 sooner. If lots of long trips on the Interstate could not reach 0 until ~7500 miles!

thill444

Jerry, I agree. I don't put many miles on my sports cars so I often change the oil more around calendar than mileage.

With periodic track days none of this matters to me anyway as my car will have fresh oil before either the mileage or calendar/OLM tells me.

JerryU

^^^
Yep, when tracking you are supposed to switch to heavier weight oil and when putting the car back on the road change back to 0-30 weight. I know some do and are changing much more the OLM says! Could have added, the next worse thing is getting the oil very hot with the car at full throttle!

dvilin

Without going crazy once a year or below 30% is a good enough guideline for normal street driving.

JerryU

^^^^
Don't have to go crazy, the OLM is smarter than any guessing. Just follow it.

Now the C7 is even smarter and uses a calendar. No need for you to keep track as I did with my C6 and prior Vettes. It does it for you.

Fellow who worked with the Phd's at GM who developed the OLM provided a very long dissertation on how it works but stopped posting since no one listened to him and would quote the old wife's tails.

He said it was conservative, why second guess- change when it says.

CSEVEN

Always 500 miles, to flush out any possible containments in oil system from engine manufacturing.

JerryU

Yep, that was the "old days" but with today's manufacturing practices and cylinder hone technology it's not really needed.

However if it makes you feel better, why not! In fact for my Z51, where the change at 500 mile Bulletin did not come out until 13 months after I got my car (and has nothing to do with metal particles etc) I changed mine at 1500 miles! Made me feel better!

I do my own oil changes (and will on my Grand Sport on order) but at the time, dealers would NOT change for free until the OLM was 20% or lower!

RedC7AZ

If a car dealer said it, then it must be false or mis-information.

dmaxx3500

first one at 500-1000 miles ,oils cheap -engines arnt

Har-ray

lol