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Double checking the lube when it comes in is basically useless in a market with decent lube suppliers. If the analisis is going to be done to check, it should be complete to determine cleanliness and level of additives. That becomes your basline for analisis of the used samples. It also...

The anti-drainback valve is the rubber seal just inside the 5 to 8 small holes in the base. The Relief valve is what you normally see at the end of the long tube. certain filters combine both at the base (Fram-which is no good for other reasons, and Luberfiner are two I know of with the combo...

First let me ask why you need to add octane? Much of the need to increase octane as a vehicle ages and the pistons fill with carbon or the injectors clog can be filxed with a simple treatment of a quality cleaning product like Techron. My Grand Cherokee pinged on premium gas (90 octane here)...

Two critical issues: Viscosity and Additives. Many manual transmissions are designed for ATF. These normally have wider conical brass sincronizers and cannot displace a 80w90 gear oil (Ford/Mazda is in this group). But if you reduce the viscosity of the oil below the designed point, you lose...