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You know what this board needs... spell check. Damn it ticks me off, bad spelling is not "cool". Anyhow, the oil you can use thinnest oil you can use is Mobil1 0-W30. BUT! You cannot switch between synthetic and regular oil once you make the plunge into the $5/quart stuff no matter how light your wallet is!
 

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Why can't you switch back, any reason why?
Not to start a flame war, but I run Valvoline
Durablend. Its half synthetic and half regular
oil. It claims that no oil can out preform it.
You would have to see the container to
see what Im talkin about, cause it has this
seal the says no other oil can make this
claim and that bottom. Oh well, to each
their own. Blaze
:)
 

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All oils are a synthetic blend, no kidding. From what I know (research, etc) synthetic oil leaves a yellow film on your engine parts. A film that conventional oil cannot penetrate. So in essence the conventional oil, when switched back to, only lubricates the film and not the actual piston, crank, etc.. As far as Valvoline's claim, in the words of Chris Farley in "Tommy Boy", "If it's the guarantee that you want, I'll take a dump in a box and slap a guarantee on it". I don't know about Valvoline, I will tell you (again) that ALL motor oil is a blend. I read about Mobil1 using a BMW 325i for a million mile test. They ran the car (indoors) for 1,000,000 miles. Changed the oil regularly, etc. The room had climate control and they were able to change temp, humidity, etc + they would make the room dusty to simulate deserts, city whatever. Point is they didn't miss a beat. Over 3 years later the car performed awesome. The spec'd the cams and all moving parts and found them barely beyond factory specs. That is a huge testimony to BMW and their metallurgy as well as Mobil1 oil.
 

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The March '97 issue of the Roundel has a story on a 1990 325i coupe that was a
test vehicle for Mobil 1 and Mobil Super Unleaded.


The facts:
Total mileage: 1,005,000 miles
After break-in (1,200 miles) only 5W-30 Mobil 1 and Mobil Super Unleaded were used.
BMW maintenance and service requirements followed completely.
Test run on an outdoor instrumented roll stand (to subject the car to changing weather conditions).
Hourly speed cycle was 75% at 80-85mph and 25% at 50-55mph.
The test was run over a 4 year period night-and-day schedule equivalent to 66 years of typical American driving.


The only failures:
2 differentials,
1 drive shaft,
1 water pump and
1 automatic transmission.
*No engine parts failed*.
Fuel injectors changed at 680,000 miles because 1 showed signs of deposits.


After the test, the engine was removed and disassembled for inspection:

"The engine was extremely clean and free of deposits.
There were no visible top-of-stroke cylinder ridges.
Cam lobes and valve guides showed little wear and were in excellent operating
condition. (The cam shaft rotated over a *billion* times during the test).
With 2 exceptions, all the engine parts were within BMW specifications.
The exceptions were...
The No. 2 piston ring end gaps were .004" over.
Two con rod bearings were .0008" over."


After the tear-down, the engine was reassembled, the car was driven from New Jersey to
Las Vegas and back, and then shipped to Europe for "display and touring purposes". BMW
inspected the engine and issued a paper on the test.
 

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I did not know about the film thing. That is interesting
My grandad used AMSOIL stuff in his
Dodge turbo deasil. He changed ALL the fluids and
he got 3 miles to a gallon better. I think sythetic
is better over all, but I can't afford it. Thats pretty
cool about the test for 1,000,000 miles. I stand by
my statement "to each there own." See ya lattas.

Blaze :sonic:
 
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