Can anyone tell me if putting the wrong grade oil in an engine can cause low oil pressure. e.g putting semi in when it should have been fully synthetic. This may sound a stypid question to a lot of you but im getting desperate for answers. Thanks
The garage has put 10-40 in the car but everyone i talk to says i should of had fully synth in it, its just that i dont know if this could be enough of a diffrence to cause low oil pressure because the garage wants to change the big end bearings now to be safe. The cars allready cost me hundreds last week so i dont want to spent hundreds more on something i dont have to do. Any ideas?
The reason they are thinking of the big end bearings is because they put a pressure test on the car and it was only on 2bar at 2000rpm, I think its suppose to be around 3.5 bar. A few peaple have said that maybe the flush was so good its got rid of something that had built up with the mileage over the years and now its gone ive lost pressure. Ive no idea whats going on, all i know is that it was fine before it had the service done. I live in Caernarfon in North wales. Thanks
Hi mate, Thanks for your reply. We have had the sump off twice fitted a new oil pump, and oil pick up pipe. The sump is so clean now it looks better than new. I thought doing these things would sort it but it hasnt thats why im drawn to thinking its the wrong oil, it was fine before the service.
Cheers for your help guys, think ill just have to sit tight and see what the garage comes up with and hope its not too bad. Dont you just hate it when things go wrong, that money could of gone towards a remap, gutted.
I've not read your other posts, but my guess would be either a worn or blocked oil pump, possibly because of the engine flush, or a stuck oil presure relief valve it these engines have one (I guess they should).
If your garage are saying they think its the big end/main bearings, ask them to take a couple of the caps off so you can have a look at the bearings for yourself. If there is any scratching or if the white metal has worn away and they have orangey patches, or if your crank is scored then you need to get the crank out and checked and reground if needed, and new bearings to suit.
Hi mate, spoke to the garage earlier and they are conviced now that it is not the big end bearings. Never heard anyone else mention the oil pressure relief valve, do you know what this looks like or where it is if i have one. The garage have got some fully synthetic vw oil today so tomorrow their going to try that if that doesnt work theyr goint to disconect the vvt solonoid in case that is stuck open. The oil pump and pick up pipe have been renewed. Any more info on the o.p.r.v would be greatly appreciated, im willing to try anything.
Just had a call off the garage. Today they drained the oil, gave it another flush, put an air line on anything that could have blocked then filled her up with fully synthetic and a new genuine oil filter and shes like new. No warning light no tappet noise and goes like a dream. Im so glad i didnt go to more expences before trying the oil. Thanks to everyone that replyed, its much appreciated. Tony