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View Full Version : '90 535ia Oil pressure--again


Dash01
01-03-2007, 10:58 PM
After warmup and with fresh 10-40 dino oil and a new pressure sensor, the low oil pressure light and readout comes on when slowing to a stop at idle. Rev the engine and/or pull away from the stop, and the low oil pressure indications go away. The check valve in the oil filter housing is OK.

Since this happened after warmup with 10-40 oil, what is the likelihood that changing to 20-50 oil will cure the low oil pressure indications?
genphreak
01-04-2007, 08:46 AM
After warmup and with fresh 10-40 dino oil and a new pressure sensor, the low oil pressure light and readout comes on when slowing to a stop at idle. Rev the engine and/or pull away from the stop, and the low oil pressure indications go away. The check valve in the oil filter housing is OK.

Since this happened after warmup with 10-40 oil, what is the likelihood that changing to 20W-50 oil will cure the low oil pressure indications?None. You won't get bad pressure with 10W-40 even if the engine is hot. But they do prefer 20W-50, unless the oil pump has lost its pumping pressure or there is a blocked passage somwhere.