Originally Posted By: Pablo
Originally Posted By: tpitcher
Pablo, Upon further review...
"As a general service guideline, the maximum drain interval for Z-ROD Synthetic Motor Oil should not exceed 5,000 miles or one year, whichever comes first. In heavily modified engines (e.g. forced induction, nitrous) the maximum drain interval should not exceed 3,000 miles or one year, whichever comes first."
I have a big Supercharger.
Will put on lots more than 3k this season, so I better go with ASL.
That does not make sense. First of all, is the supercharger an aftermarket unit?
Second of all, the SAME warning goes for ASL. You can't do any longer OCI in an API SN oil in a "heavily modified engine", at least without a UOA.
Yes, I have a large, Forced Induction aftermarket Supercharger.
Applicable to our conversation ASL Service Life:
"SERVICE LIFE
AMSOIL Signature Series Synthetic Motor Oil is recommended for extended drain intervals in unmodified(1), mechanically sound(2) gasoline-fueled vehicles as follows:
• Normal Service(3) – Up to 25,000 miles or one year, whichever comes first.
• Severe Service(4) – Up to 15,000 miles or one year, whichever comes first.
• In all non-gasoline-fueled vehicle applications, extend the oil change interval according to oil analysis or follow the OEM* drain interval.
(1) Engines operating under modified conditions (non-stock) are excluded from extended drain recommendations. Examples include the use of performance computer chips; non-OEM approved exhaust, fuel or air induction systems; and the use of fuels other than those recommended for normal operation by the manufacturer.
(4) Turbo/supercharged engines, commercial or fleet vehicles, excessive idling, vehicles with more than 100,000 miles without prior continuous use of AMSOIL motor oil, daily short-trip driving less than 10 miles (16 km), frequent towing, plowing, hauling or dusty condition driving."
So, it's excluded from severe service condition 4 extended service life, but not say: "
Z-ROD Synthetic Motor Oil should not exceed 5,000 miles or one year, whichever comes first. In heavily modified engines (e.g. forced induction, nitrous) the maximum drain interval should not exceed 3,000 miles or one year, whichever comes first."
ASL doesn't mention anything like 3,000 miles, even if it's an aftermarket FI , if you follow me...
