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Serious Thumper 2005 No Login
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Professional "scooter trash".
Posts: 5207
Rosemark TN
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You must not have ever played around much with 2.4L Subaru flat 4s. Oil leaking, sludge generating junk heaps. My 72 Super Beetle has cleaner oil than our 95 Subaru. My 94 2.3L Ranger keeps its oil amber for almost a year, and in essence it's nothing more than a fuel infested PINTO engine, with dual ignition.
Savage valve train is actually early 1960s Honda, except Soichiro's engineers were smart enough to run the cam in actual caged ball bearings, not in the base metal of the head castings. I popped the top off my 63 Honda 250 twin engine last week, everything is flawless, it all looks factory fresh (until you look in the intake and exhaust ports).
If you really think your engine is sludged up, drain the oil, replace with Dex 3 ATF, run it for a couple minutes and change it again. If it is sludged or coked (carboned) up, that will clean it out. And it will be very obviously BLACK coming out if the engine was disgusting inside... There's enough actual oil in ATF that it won't cause any damage. It's basically 5 weight, red dye and soap.
Had to use it to deglaze my clutch plates back when Castrol GTX 20W50 was switched from good to energy conserving. Didn't hurt a thing in the engine, the clutch quit slipping, the head got decoked, and the engine has since run a lot cooler.
It isn't a close tolerance engine. The oil is going to get dark in a hurry. As long as it doesn't smell burnt, you're fine.
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