My son is trying to convince me to add ZMax oil and gas additives to my 2001 Yukon 5.3L as my wife tells me that the rig doesn’t have as much giddy-up as it used to. Lots of mixed reviews on the net…anyone have any experience with this product? I’m thinking having injectors cleaned would be a better idea.
Pete
Engine Oil manufacturers spend billions of dollars on research and development to manufacture and design Oils that meet the API regulations of an automobile manufacturer. There are strict guidelines in what can go into an engine oil blend to maintain warranty and emission standards. Lets take for instance the new API SN specification that is the latest for 2011 and newer vehicles. The API will not approve an engine oil unless the additive chemistry” muscle” of the oil is cut back as much at 30% due to its effects on the converter. In essence the new engine oils have been dumbed down to meet regualtion. By putting a completely foriegn material into a certified oil you can run into all sorts of challenges and essentially void warranty of a new vehicle and cause harmful effects to an older engine.
My suggestion would be to buy a fully formulated lubricant that has been certified by the API for your year of vehicle.
Royal Purple has a very good beefed up chemistry pack that compensates for the changes in the API certification. I would go with 5w-30 or 10w-30 HPS. Fully synthetic, meets manufacturer specs and will give you vast improvements in engine performance from past parasitic loss due to wear and tear.
Just a suggestion. Good luck with your research
Ace
Certified Petroleum Engineer
Unless done recently plugs and plug wires will probably give your Yukon some zip back.
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