Quote:
Originally posted by Mike Guenther:
One other thing about synthetics. I had a great 1977 Pontiac Firebird that I drove very hard for over 250,000 miles on Texaco Haveline 10W40. With about 30,000 miles on it I let a shop talk me into trying a Mobile synthetic on an oil change. I drove it about 50 miles and it was tapping so bad it was scary. I dumped that rather expensive synthetic oil and put in the Haveline. I sold the car with over 250,000 miles and it still ran like a champ. A complete chassis rebuild, new A/C and a couple of custom paint jobs, but only one tune-up and spark plug change and no engine trouble ever in over 20 years that I had that car. Needless to say, I'm no fan of synthetics in the crank case. I use Haveline 5w20 in my V10 Excursion. 80,000 miles in the last two years. I used to use only Haveline in my race cars also, but Carl Sloan said he preferred Valvoline VR1, so I've been using that in the race car for the last few years.
I lost a rotary after switching to synthetic, and lost another after swithing from castrol 20/50 to 10/30. there were other factors but I thought it was worth mentioning/