It would help if you could fill us in on some more details, such as:
- Mileage on car and engine
- What was the compression
- Which cylinders are affected (MB numbers them as 1,2,3, & 4 on the passenger cylinder bank, and 5,6,7 and 8 on the driver's side on their V8's)
- What is the general condition of the car (interior, exterior, transmission, etc.)
Low compression are either headgasket or the heads. Could be quite expensive, and if the rest of the car is questionable the repairs might not be worth it to you.
no it doesn't use any oil, no smoke eather, the exhaust does puff out the tale pipe like it's missing. should I use some additive? if I switch to 20-50 should that fix my proplem? and what kind of oil should i use
a Lucas additive may help a little, but you either have a worn cylinder/piston ring, bad valve seal, head gasket leak.. the are a number of things that can go wrong. did you use a standard threaded hose that goes into the spark plug hole with a pressure guage on the end? did you do a leak down test? that will determine wether or not it's a *problem*. if anything, synthetic 20-50 and an additive will at least reduce further wear on the cylinder walls/rings.
i want you to do something else. retest your compression on the two low cylinders but this time, pour a bit of fresh motor oil in the spark plug hole first. this will help eliminate some variables so we can narrow it down to the exact problem. get back to me with your results. :thumbsup:
just deal with it for now. switch to synthetic 20-50 motor oil and if you want, use an additive. when you have the money in the future, just have a rebuild done. new seals, gaskets, piston rings, and all the internal wear items. when your ready, be sure to do plenty of research, and find someone experienced with these cars.
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