Myth or Fact - While breaking in a NEW motor dont use synthetic?

over 40 five oh driver · 08-31-2001, 09:32 PM

Keith Craft recommends not running synthetic oil for first ... 5-10K miles?? Can't recall exactly, just that I ran synthetic a little early. Doesn't hurt anything as I recall, just takes the rings longer to seat perhaps. Much of it depends on what the rings are made of, brand etc. Best bet is go with engine builders recommendations! I happened to miss this from Keith Craft somehow, but again, mine still runs like a scalded dog! Just seems like it kept pulling stronger and stronger until about 5000 miles it leveled off...just subjective on my part. Good luck on the new motor though.

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92'GT, Keith Craft Racing 306 (10.25:1 CR), PRO-M 80mm MAF,65MM TB, Edelbrock U/L intake,
TFS-TW heads milled/ported, CompCams XE274HR (.555/.565" lift w/1.6 rockers), A-351 adjustable roller rockers, 30# injectors,
Kirban FPR w/external pump, FRPP ceramic coated headers, Bassani X-pipe w/cats, Bassani cat back, Centerforce DF clutch/T.O. bearing...MSD 6AL w/MSD distributor, Steeda Tri axe, aluminum D/S, 3.73's, w/Factory Five U/L control arms. Lakewood 50/50 shocks. Steeda Front Drag swa

08-31-2001, 09:32 PM	#3
over 40 five oh driver Registered Member Join Date: Sep 1998 Location: Oklahoma City Posts: 278	Keith Craft recommends not running synthetic oil for first ... 5-10K miles?? Can't recall exactly, just that I ran synthetic a little early. Doesn't hurt anything as I recall, just takes the rings longer to seat perhaps. Much of it depends on what the rings are made of, brand etc. Best bet is go with engine builders recommendations! I happened to miss this from Keith Craft somehow, but again, mine still runs like a scalded dog! Just seems like it kept pulling stronger and stronger until about 5000 miles it leveled off...just subjective on my part. Good luck on the new motor though. ------------------ 92'GT, Keith Craft Racing 306 (10.25:1 CR), PRO-M 80mm MAF,65MM TB, Edelbrock U/L intake, TFS-TW heads milled/ported, CompCams XE274HR (.555/.565" lift w/1.6 rockers), A-351 adjustable roller rockers, 30# injectors, Kirban FPR w/external pump, FRPP ceramic coated headers, Bassani X-pipe w/cats, Bassani cat back, Centerforce DF clutch/T.O. bearing...MSD 6AL w/MSD distributor, Steeda Tri axe, aluminum D/S, 3.73's, w/Factory Five U/L control arms. Lakewood 50/50 shocks. Steeda Front Drag swa