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Mr. Blake Perrott,
Sir, may I please urge you to first inspect and verify the positive crank case ventilation (PCV) on the engine of your normally-aspired 1998 Volvo S 70 is in fine fettle and is without blockage and vacuum leaks.
A clog forms from condensating hydrocarbon products from engine combustion leaking past the oil control and engine compression piston rings, the value guides as to valve guide seal and valve guide journal wear. Clogs first form at the PCV sieve or flame trap or valve. With such clogs at the PCV sieve, flame trap, or valve, the engine-block mounted oil separator breather box itself can become clogged.
A clogged PCV will increase oil consumption and force oil out the lower engine oil seals and, in worse case, gaskets. Lower seals can become dislodged over time due to clogged PCV and high engine sump pressures in hard, or spirited, driving.
Also, a clogged PCV prevents the engine intake vacuum-driven combustion (consumption) of combustion products and other hydrocarbons that boil off with hot engine oil and combustion blow by. This is a necessary emission control.
If you do not have an OBD-II code scanner, may I also suggest you contact your local Kragen, AutoZone, and like auto parts stores, so you can check for OBD fault codes across all control systems before cracking the engine open on your 1990 Volvo S 70.
I'm unsure of when value guide seals, and in turn, the valve guides themselves (and the space between the valve stem and inside diameter of the valve guide itself, become a wear item needing replacement on your 1998 Volvo S 70.
Also, if you are able to find and clear the PCV clog, and oil consumption remains an issue for you and your 1998 Volvo S 70, may I suggest an engine compression or leakdown test?
An easy way to verify a clear EGR, with a cold engine that is OFF, is to remove the one or two EGR system vac vapor hoses at the air intake port (manifold - these are ports on fuel injected cars) or throttle body. Clean the end of the vacuum hoses. Remove engine oil fill cap, and then blow through the end of the one or two ends of the EGR vacuum line. Can you easily blow through it? Hear the air displace through the engine and out the oil fill cap? Your EGR may not be clogged or entirely clogged at all. On this board, some may use a method to verify EGR vacuum through the EGR vac vapor line piping through the engine block by loosening the oil fill cap so it rests, yet is not locked on the engine oil fill cap stem. Start the engine and observe the oil fill cap, Should stay on teh engine without rattling or moving off the engine oil cap stem mount.
Another symptom of clogged EGR is the engine oil dipstick popping up out of the tube. Though, at the mileage and age of the 1998 Volvo S 70 you own, you may want to consider replacing the engine oil dipstick O-ring, at the top of the engine oil level check dipstick. This symptom is more apparent on white block turbo charged engines, as the turbo charged engines routinely generate much higher pressure in the engine oil sump chambers.
As I'll be in back in St. Louis MO, the town of my manufacture, in some weeks or so, I'll be glad to stop by and help in person.
My offer stands for all used Volvo owners in the St. Louis region. (Just diagnosis. Not repair. I hate to see folks get ripped off by the auto repair facilities.)
Questions?
Hope that helps you,
Museum of Transport on Barrett Station Road in St. Louis County, MO.
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