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Old 07-25-2010, 04:30 PM
 
Location: Yucaipa, California
8,307 posts, read 9,881,041 times
Reputation: 4589
All oil is not the same. Awhile ago i had a 77 chevy malibu that fouled out (plugs) every 200 miles. I had to remove & clean them a few times a month. I used house brand oil like walmart, kragen auto zone, etc. I switched to quaker state & it fouled out at 2k miles. It was quite a difference & worth the xtra money. I sold the car & told the new owner to only use QS. He didnt & the engine blew 6 months later. I did use valvoline a few times on my 90 Tbird & it would turn pitch black @ 2k miles. QS didnt do that & i use it on my 85 olds. I dont drive the Tbird anymore thanks to a careless driver & the dmv wanting a leg, arm, etc.
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Old 07-25-2010, 05:36 PM
 
Location: Northeast Tennessee
6,994 posts, read 13,896,685 times
Reputation: 5142
Both of my Lexus LS400s (one was a 1990 and one was a 1991 - over 200K on each) still had a dark brown (not black) oil at the end of the 3000-4000 mile interval. Around 2000 miles, still looked like new oil. Last time the dealer said I could go 5000 on the Lexus oil change... I did and I checked it before I took it in... it was still full on the stick and it was dark brown and not black, even with 5000 miles on it. Something special about those 4.0L Toyota V8s. My 4.7L Tundra was the same way. Now I have had some cars that the oil turns dark (chocolate brown) before 1000 miles.
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