I'm still using the viscosity stated on my oil filler cap: 5W-30. My engine now has some 345,000km up and is just starting to go through a noticeable amount of oil between changes... and I still can't be sure if it's consuming the oil or it's leaking out around a stripped-threaded power steering bracket bolt (there is an obvious leak there). I use Castrol Edge full synth. I'll consider Fuchs... for those around Newie I believe Pitcrew (who were Rampage for a while) in Albert St, Wickham, stock it.
Around 200,000km I tried 15W-40 thinking the engine might be getting tired. It made the performance very sluggish, I couldn't wait to flush it out.
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The Frankenfalcon... AU1.5 Wagon, BA brakes, AU2 booster, BA2 XR6T engine, stock from airbox to turbo, 8psi/98 octane tune 240RWKW, BF XR6T cat, quiet 3" zorst, Pex BSO660 & BSO439 mufflers, 84 db, built BTR box, 3.08 LSD, Emer SVI LPG, AU1 XR8 alloys, Momo wheel, JVC KDR746BT head unit, Aerpro steering wheel control wiring.
Sleeper, anyone?
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