Oil coming up the blow by tube

call or notify a bone/junk yard they have the cross reference charts for vehicle parts or try a gm dealer these are a few that are compatible 97-99 Pontiac Bonneville SE 6Cyl 3.8L 231CID VIN K Fit Note Engine VIN: K, Naturally Aspirated 97-99 Pontiac Bonneville SSE 6Cyl 3.8L 231CID VIN K Fit Note Engine VIN: K, Naturally Aspirated 98-99 Buick LeSabre ALL ALL 97 Buick LeSabre ALL ALL Fit Note With Harness Codes: HEN, HER 97-99 Oldsmobile 88 ALL ALL 97-99 Oldsmobile LSS ALL ALL Fit Note Engine VIN: K, Naturally Aspirated 97-98 Oldsmobile Regency ALL ALL

it might be the sending unit, is it a buick 350 or a chevy. 350? if a buick engine the sinding unit should be on the side of the timing cover if a chevy 350 next to the dist.

remove the oil sinding unit and install a manuel gauge and see just what the oil pressure is if below 10 psi at hot idle replace the bearings and oil pump in the engine. if this is a chevy 350 make sure you replace the camshaft bearings this is were we use to see the gratest oil pressure loss.

Start the motor and use a flashlight to locate where the oil will be dripping from.

A park Ave. is a Buick and a 5th Ave. is a Chysler the Buick can have 3 different engines so I need to know which engine. The cysler 5th Ave. is a 318 400 or 440 the buick is a 455 350 olds or a 350 chev or a 350 buick. 3.8 buick. The 8th number in the VIN will tell your parts store guy and he shoul be able to prvide the belts and the picture of how they go on. Sometimes the picture is on the fan shrould and sometimes it's on the package the belt comes in ( some gates belts that only fit your car.

Did it stay there? If so, put a pressure gauge on the engine, to check the actual pressure and then you will be able to tell if it is just the sending unit/pressure sw , that is off.

The oil sending unit is on the oil filter adapter above the oil filter.You will need a special socket for the unit.Good luck.

Sounds like the engine can't breath,
make sure pcv valve is good,or oil cap is vented.
your engine is building up pressure and has no where to vent,so it blows the easiest thing,the dip stick

It could be the oil pump, its not a bad idea to check the type of engine oil you are using maybe you can go a little higher in grade,
you can also try to use STP Engine oil treatment for petrol (gas) as addative to the engine oil it may help.
Hope this helps!

The oil pressure sending unit is located behind the oil filter, Threaded into an aluminunm housing. It has wiring that plugs into the sending unit. The oil filter has to be removed and you will need a deep well socket and a 6 inch extension. Change the oil and the sending unit together.

between engine and trans near oil filter