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I've always been told as a motor gets older, the wear and clearances/tolerances of that said motor become sloppy. Every vehicle I have owned, once it gets over the 100k mile mark, has been given the 20-50w oil(usually Castrol GTX). Oil changed every 2500-3000 miles. I have had no issues with blowing motors although I did detonate my TT a couple years ago on a highway pull. The bottom ends of all my cars are in perfect shape and Ash actually commented on how good the bottom end of my tt motor was and he was like" what weight of oil do you use?" So personally I use 20-50w. Always have, always will.
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****472 RWHP/461 TORQUE ON 110 RACE GAS @21 PSI
****438 RWHP ON 93 OCTANE PUMP GAS/STOCK MOTOR****
****429 FT LBS/TQ******************************* Also own: 2001 Harley Davidson Custom Softail Deuce
1997 Ford Explorer XLT V8 AWD
1993 300ZX 2+2 NA
1991 Yamaha YZ250
1985 Ford Bronco 3" lift, 35" Tires Sold:
1986 Yamaha FJ1100
1987 Nissan 300zx na(Z31)
1979 280ZX 2+2
1972 MGB
1968 Pontiac Firebird
1972 Nissan 240Z, dual webber carbs, etc
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