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Oh god... I would always recommend doing your own oil change. These cars came out the factory very happy on 20W50. The lighter oil is not good in these cars (some may say different). I use 20W50 in the summer and 10W40 in the winter and it runs strong with perfect oil pressure (hot and idle 3 bar to about 3.75 bar).
Where is your oil pressure at?
The thinner oil would not provide adequate pressure and it sounds to me that the bearings are not happy and your valves might be clacking away from no lubrication (your hydraulic lifters might also not be pumping up correctly which would effect performance).
CHANGE THAT OIL... thick... its cold in canada so use the 10W40 first and use a Mahl filter or a Porsche filter.
I'd go back to them and give them a piece of my mind... if I were you.
They were just trying to make a buck off ya... where did you go anyway?
::EDIT::
Before you put anything in, get those compression numbers to be sure things are OK. If those seem fine for the age and mileage, then do the oil swap. Get back to that place you went either way... there are bones to be picked.
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1987 944 N/A Gray on Burgandy, Manual. Koni adjustables, lowerd. 16" two-piece Five spoke French rims. BROKEN.
2004 Pontiac GTO. 40th Anniversary Pulse Red 6-Speed with Pacesetter Long Tube Headers, catless mids, drag springs, DBA Slotted Rotors with C5 Hawk Pads. Tuned By Staging Lane Performance.
Last edited by Gremlin85; 03-12-2007 at 03:52 PM..
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