Ross_K wrote: 07 Jan 2023, 14:44
My feeling is this stuff is a waste of money.
Do you have problems with excessive oil consumption or oil leaks, or do you just want to use it as a preventative thing?
Yes I do have problem with high oil consumption and shaking engine while stop with unstable IDL , also i notice some oil on the head a spark plug .and some garage told me its a piston ring issues
I came in here to say "if you've got so much oil leaking out your engine that you wonder will an additive dissolve your cambelt; it's not something an additive can fix". But discovering that the belt runs inside the oil has totally flabbergasted me.
Oil on spark plug could be coming in from a goosed turbo, wearing valve stem seals, or as your mechanic suggests, piston rings. Get the mechanic to do a compression check on the engine, worn piston rings would give a lower compression number. If it is indeed piston rings, again, it's not something that an oil additive will fix.
The best case scenario for a ring based problem is that it's just the rings are sticking in the piston, rather than expanding out in the land to meet the cylinder walls. The good news is that if that is the case, it's easily fixed, a good old "Italian tune up". Start this off by doing an oil change so the engine is running on some really clean oil, I'd normally suggest a detergent oil from a diesel or an engine flush additive, but to be mindful of the stupid wet belt, just go with clean oil, a full tank of fuel, and drive the car like you stole it until the fuel light comes on. Once the fuel light comes on, refill the tank of fuel, change the oil, re-run the compression test and hopefully see an improvement.
Is the oil on the top of the sparkplug at the ceramic end or on the bottom at the electrode? As in is the only on your sparkplugs at that part that is at the top of this picture or bottom of this picture:
