Gentlemen, I've searched high and low for a high performance light weight synthetic oil but can't seem to find 5w30. I'm real hesitant to use a heavier weight due to the operation of variable cam timing phasers that have been modified. I've used your products religiously in my class 8 truck, and marine equipment. I'm not a proponent or believer in snake oils, but your products DO work! All I hope is can provide me with the product oil I'm looking for. Thank you in advance for your time and assistance. -Steve Fucile