MOBILE 1

XFORD · June 8, 2004

I have a 6.0 L and have ran MOBILE 1 since the first oil change. Will this effect my rings from seetting? I was told it could. I now have 30,000 mls on it and it now just went thrue 3 qrts in 3400 mls. The 1st 2 qrts in the 1st week and ahalf.

snoman · June 9, 2004

It is advisable to but 5 to 10,000 on truck before you switch to properly seat engine parts. Also try 10w30 instead of 5w30 in the engine too! I have used mobile one for 15 years+ and I have never regularly used 5w30 except in the winter when I lived in Montana for a while and it could see 50 below..

carguru · June 9, 2004

Running Mobil 1 from day 1 will have no adverse effects on the engine. I'm a longtime user of Mobil 1. I use 5W30 (recommended weight) in all of my vehicles. It is factory fill on 'vettes, Porsche, Lexus, and BMW. If there are issues with rings seating, I'm sure that it wouldn't be factory fill in these vehicles.

Did the oil consumption just start? How much oil did it use before? Are there any telltale signs of leaks on the engine?

snoman · June 9, 2004

Running Mobil 1 from day 1 will have no adverse effects on the engine. I'm a longtime user of Mobil 1. I use 5W30 (recommended weight) in all of my vehicles. It is factory fill on 'vettes, Porsche, Lexus, and BMW. If there are issues with rings seating, I'm sure that it wouldn't be factory fill in these vehicles.

Did the oil consumption just start? How much oil did it use before? Are there any telltale signs of leaks on the engine?

But I think you will find that they run those engines in a bit more and may in fact even prep cylinder differently. It is widely known that break ins on synthetic oil can lead to inproper ring seating in some cases and higher oil consumption. .

Cool Zr2 · June 9, 2004

Bring it to the dealer and tell them to fix it, its gotta be under warrenty.

dougsster · June 9, 2004

I switched my 02 k2500 6.0 at 1200 miles, always used 5w30, never had any oil consumption up to 25k when I sold it and never had any engine tick, piston slap etc...Would not use anything else. I usually baby them for the 1st couple hunder miles, stomp the hell out of em to about a 1k and switch to mobil one as soon I can after that....Never had any problem!

Doug

XFORD · June 9, 2004

It's at the dealer right now! We will see what they say. I'v always noticed that it was down 1 qrt at 3400 mls. that's when I allways change the oil. But didn't think a big deal since I owned a ford before. Thats just the way it was!

snoman · June 9, 2004

I consider 5w30 too light for a truck or SUV unless it is very cold. I have a 89 burb that I have used Mobile on in since about 6000 miles. It has 170,000 now and it might use 1/2 quart between changes (4 to 5000 miles) which is nothing in my book. It is still quiet as a church mouse with same oil pressure and not the slightest tick too. We still use vehical for cross country trips.

Butch 02 Denali · June 9, 2004

I too believe 5-30 is too light unless you live with the polar bears! I use 10-30 M1 year round and have in both my trucks since the first oil change at 3000 miles. I live in New England and we get some 0 degree days once in a while and had no problems with the 10-30, instant oil pressure and no knocks, cold or hot. I believe you can change to synthetic after 500 miles, the rings are all seated by then.

Butch 02 Sierra Denali

snoman · June 9, 2004

I think it takes a bit longer than 500 miles to do it right.

Charlie in TX · June 9, 2004

Am I missing something here. 5w-30 or 10w-30 for all intents and puposes, in the summer are the same weight. The 'w' stands for winter or cold weight rating. If I recall (CRS), cold is at 0deg F. The number is a viscosity rating at 72deg F. So a 5w-XX oil will have the same viscosity at 0deg as 5 weight unmodified dino oil.

The only important number in the summer is the larger number. The temp in summer never gets cold enough to require the oil to act at its winter weight. Heck, down here our winter dosn't make the oil act at its winter rating.

Machine · June 9, 2004

Mercedes, BMW, Porsche, Ferrari, Lambo, Jaguar, and the Corvette all come with synthetic oil already running through their veins. Synthetic oil from the get-go should be fine in a gas-operated engine.

If Mercedes and Porsche approve then I can't argue.

Here's a tidbit of info for you: GM recommends 5-30 for their engines that are already installed but they recommend 10-30 for crate engines. Hmmm.

carguru · June 10, 2004

Am I missing something here. 5w-30 or 10w-30 for all intents and puposes, in the summer are the same weight. The 'w' stands for winter or cold weight rating. If I recall (CRS), cold is at 0deg F. The number is a viscosity rating at 72deg F. So a 5w-XX oil will have the same viscosity at 0deg as 5 weight unmodified dino oil.

The only important number in the summer is the larger number. The temp in summer never gets cold enough to require the oil to act at its winter weight. Heck, down here our winter dosn't make the oil act at its winter rating.

You hit it right on the head. With Mobil 1, if you really want to get technical about it, 10W-30 and 5W-30 has very little difference as far as the flash point (5 degrees), but I would rather have the extra protection gained from 5W-30 being able to flow slightly better. The added bonus is a slight increase in fuel mileage from 5W-30.

Unless things have changed drastically in the way the engines are built and tested, the engines from the 'vettes and some of the truck engines are assembled in the St Catherines, ON plant. True they are on 2 separate lines, but the test routines are the same. No special cylinder prep, no extra run in.

snoman · June 10, 2004

Am I missing something here. 5w-30 or 10w-30 for all intents and puposes, in the summer are the same weight. The 'w' stands for winter or cold weight rating. If I recall (CRS), cold is at 0deg F. The number is a viscosity rating at 72deg F. So a 5w-XX oil will have the same viscosity at 0deg as 5 weight unmodified dino oil.

The only important number in the summer is the larger number. The temp in summer never gets cold enough to require the oil to act at its winter weight. Heck, down here our winter dosn't make the oil act at its winter rating.

You hit it right on the head. With Mobil 1, if you really want to get technical about it, 10W-30 and 5W-30 has very little difference as far as the flash point (5 degrees), but I would rather have the extra protection gained from 5W-30 being able to flow slightly better. The added bonus is a slight increase in fuel mileage from 5W-30.

Unless things have changed drastically in the way the engines are built and tested, the engines from the 'vettes and some of the truck engines are assembled in the St Catherines, ON plant. True they are on 2 separate lines, but the test routines are the same. No special cylinder prep, no extra run in.

THis is not entirely true because conventional 5w30 stops flowing around 25 below or so while Mobile 1 10w30 flows down to minus 60 or so. 5w30 averages a lighter viscosity than 10w30 amd all the theory say it does not matter, it does in reality. Mibile 1 did not even have a 5w30 oil for many years yet advertised their 10w30 still flowing at temps unheard of for conventional oils.

dougsster · June 10, 2004

I dunno guys....I see AMG powered 5.5 liter supercharged monsters that start out their lives on 0w40 euro formula mobil 1 and dont get their oil changed for the 1st time until about 10,000 miles. Mercedes has been on the FSS (flexible service) since 98 and we see cars daily with 150-200 k on them that run fine, dont leak and use little to no oil between services of 10-13k.

Long story short....The general says use 5w30....I use 5w30. I do however refuse to accept the gm oil life system and will continue to change my oil over 3k.

.02

Doug