I changed my oil from castrol 15W50 to Delvac 1 5W-40 and now my oil pressure gauge is acting funny. when I put the key in pre start position the gauge is already at .9 bar. could the viscosity of the oil have something to do with it or maybe the sending unit is going bad? I have a 1995 E300D

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Trying to keep Jersey Fresh

1995 E300D 384,000,(Betty White) part time greaser, lots of new parts
2004 Ranger XLT
2000 Chocolate Lab-Bad Quarter Panel, lots of miles