Topic: Low Oil Pressure with Synthetic Oil?

[articsteve]

The reason your oil pressure is low is due to the longer oil filter.

Not really.  Explain

The reason for your drip is the flow properties of synthetic oil. A high mileage engine like yours will have seal wear, and synthetic oil is designed to flow easily.

Not really.  Synthetic oils clean gunk out of motors; cleans gunk out of seals that have depended on that gunk for some sealing as the seals shrink underneath that gunk  

You need a high mileage engine oil. There is a brand on the market specificly for high mileage engines. They have seal conditioners in the oil that make the seals swell and prevent leaks.

I think that is marketing BS.  From the numerous oil seals I have pulled out of motors I do not think that there is anything that can restore them to original size as oil seals are usually rock solid by then.

[mark]

The low pressure *might* be due to the larger filter if it is significantly larger, and you did not compensate for the increased size of it by adding more oil.

[tpl]

Where is the oil pressure relief valve on this engine?   In the filter, in the oil pump or a standalone thingy screwed into the cylinder block. ( all 3 of those have been used at one time or another)

If it might be in the filter then go and buy a genuine dealer filter. Are you sure the old O-ring was taken out of the filter housing... they usually stick to the filter but not always