mammoth713

I cant find any official literature on Mobil's website on change intervals. A lot of people go 3k-5k miles on Mobil 1 oil but most people do not speak in terms of TIME.

I live in LA so both my cars average only around 3k miles/yr... I have been averaging about 1 year, 3k miles on each of my cars.

Do you think it's ok to go a year per oil change? I use normal Mobil 1 10W-30 w/ bosch 3332 filter and/or Mobil 1 "High Mileage" 10W-30 w/ bosch 3332 filter

Also... What's the difference w/ high mileage Mobil 1 vs normal Mobil 1? Can/should I put high mileage Mobil 1 in my c5z even though it has 40k miles?

bobs77vet

yes 1 year and 3000 miles is just fine even more on both ends would be fine....5,000 miles or 1.5 years would be my limitations.

Velocity_Vette

One year is the typical consensus for cars utilizing synthetic oil that do not reach the mileage requirements for an oil change. Synthetic does receive a bit of additive break down like any oil does but it's not to the same degree as non-synthetics. Regardless if you do not reach roughly ~5,000 miles a year you should change it yearly (your DIC's oil life meter runs based off your habits but it will typically reach oil change period between 4,500-5,500 depending on how you drive).

Oil brand choice is largely up to the individuals' preference but it needs to meet the requirement for GM Dexos (currently Dexos 2 standard). Many oils also meet Dexos without being official tagged as such (such as Amsoil). 40,000 miles is not high mileage - barely broken in. Many get well into six digit territory running the run-of-the-mill 5w30 Mobil 1 recommended oil. Myself that an an AC Delco filter have been all I've ran.

mammoth713

In respect to my high mileage question.. even though my c5z has 40k miles, I was thinking the car is 14 years old.. But mainly the fact half the time that's all walmart has near me; sometimes they don't have normal Mobil1

DDaaryl

I put 2,000 miles a year on my 02 vert. That being said I change the oil and filter every 24 months. Don't care what the dealers or oil companies say. They are motivated by $$$, not facts.

c4cruiser

Lots of other places to get Mobil-1 beside Wally World. Amazon has a number of Mobil-1 oils by viscosity at similar prices. Same with Costco if you are a member. For mileage, I don't think that 40K miles is reason to look at high-mileage oil. I have 38K on my supercharged '02 coupe and I use the "regular" Mobil-1 5W-30. The car doesn't get a lot of miles each year, but I do change oil each year. The car is garaged, but winter weather is moist enough here in the Pacific Northwest, I do the oil change in the early Spring and they take the car for a 30-50 mile drive to get any condensation out.
There is a Mobil-1 version made for annual oil change intervals. Might want to look at that.

'Shifter

I do mine every year...

The Rabbi

Once a year is enough. Now that my car has 100k my tech suggests twice a year. Dusty climes should change more often also. Why don't you contact Chevrolet for their suggestions or if you have a manual it's in there. As far as the hi mileage oil I doubt it would matter but check with Mobil direct. They all have customer service.

cv67

Back in the 60s dealers recommended every 6k. Your car is anything but high mileage nothing to worry about.
In fact I use cheap dino oil these days (still use a good wix filter)I dont buy into the "has to be synthetic or else" stuff. Quieted those noisey LS lifters!

Vetteman Jack

apex26

High mileage oils have weird additives, like promoting the swelling of seals. 40k is nowhere near high mileage. Don't indiscriminately pour that in without first checking with the manufacturer. Personally, no way I'd do it with my '03 with 27k.

FX VETTE

grantv

GM Corvette manual says once a year minimum. Works for me.

2TONE82

I put ~2K miles a year on my Z16 and change the oil/filter once a year, around Thanksgiving and Christmas, before she goes night-night for the winter months. Do the same for my '82.

ArmchairArchitect

Best source of info is on the forums at bobistheoilguy.com. Those guys are oil geeks and obsess over this stuff, and have lab analysis results to prove it. You can see examples of lab analyses for oil 2 years old.

I don't do many miles on any of my cars, so it's 2 year intervals on the non-sports cars, and 1 year on the C5Z (better to be safe than sorry) since the car is driven hard.

grampi50

What dino do you use?