FWIW, I run only AC Delco PF47 or PF52 filters (can be found anywhere, are very reasonably priced, and always seem to do well in oil filter tests). We use royal purple in the '02 GTP and it gets changed every ~5k miles or so. I run the Mobil 1 "clean 7500" or whatever it is in m GT, it is the synthetic blend stuff. I am kinda paranoid so I change my oil every 2500 miles or less (never more) so I don't see the need to spend $5+ a quart for full synthetic, I would run it if I didn't change my oil so much. Plus usually I do work to the engine more often than I need an oil change and I end up changing it before I need to anywas. I used the run the valvoline durablend but the Mobil 1 is cheaper....lol. We use valvoline durablend in the SSEi and have since day one. It gets oil changes when the DIC says to do so and since its all highway miles that is usually every 7-8k or so.
iF ROYAL PURPLE IS A SCAM SO IS MOBIL 1 I GUESS? Wink IF THERES NO OIL RELATED BREAK DOWNS WHY NOT JUST RUN VALUE TECH OIL FOR 89 CENTS A QUART INSTEAD OF MOBIL ONE?
FWIW, I just poured 5 quarts of that no name brand oil in my engine today. But I just had it torn apart and it will be getting a change in like 100 miles....lol
1990 Maroon Grand Prix STE McLaren 3.1 Intercooled Turbo, 14.695 @ 94.49 on 12psi before cam/heads/etc.
1990 Bright Red Grand Prix McLaren 3.1 Intercooled Turbo, 14.819 @ 92.72, 189whp
1999 Grand Prix GT 9.75:1|K&N|160 tstat|No Ubend/Cat/Res|UD Pulleys|Ported M90/TB/Heads|XPZ|2.55"|Pacesetters|Stage 2 I/C. 12.442 @ 112.78
2000 Blue Bonneville SSEi Supercharged Gutted Airbox|K&N|3.4"|1.9'*|WP Pulley|Custom DHP|180*stat|41932'*|No Cat. 14.681 @ 94.80
2002 Dark Cherry Grand Prix GTP Supercharged & Intercooled
12.084 @ 114.38 w/1.743 60', 315.6whp, Fastest Stock Cam M90 GTP!
NOW XP CAMMED, 340.6whp with XP, stock heads, Gen 3 M90, 11.984 @ 115.84 w/1.750 60'!
Most HP Stock Heads Gen 3 M90 GTP!
2004 Red Monte SS Supercharged K&N|3.4 Pulley|1.9'*|180*stat|41919 plugs|3" dp|No cat/ubend|DHP|Shift Kit. 14.2 @ 98
GOT BOOST??? Friends dont let friends drive stock!