Hi
I did a search under VOA and could not find anything about Syntec 5W-50, I am thinking about 50/50 mix of Syntec 5W-50 and Castrol GTX 5W-30 in my dad's piston slapping Grand Am 3.1.
Two months ago I put Delvac 15W-40 in it and now when it warms up (at least about 5 km trip)it really runs quiet, except for starts when it seems just as loud as before on Shell 10W-30. It could be the higher viscosity or maybe the molly (although pretty low ~70ppm IIRC) in Delvac that did the trick.
I recall that someone here (Patman???) once said that GTX and Syntec have the same/similar additive package, therefore TBN shuld not drop too much in such a mix.
I know that mixing is OK but would like to call upon the collective wisdom of the board to be sure.
Any points of view greatly appreciated.
LOVE THIS BOARD!
I am an oil nut and proud of it Tnaks
I did a search under VOA and could not find anything about Syntec 5W-50, I am thinking about 50/50 mix of Syntec 5W-50 and Castrol GTX 5W-30 in my dad's piston slapping Grand Am 3.1.
Two months ago I put Delvac 15W-40 in it and now when it warms up (at least about 5 km trip)it really runs quiet, except for starts when it seems just as loud as before on Shell 10W-30. It could be the higher viscosity or maybe the molly (although pretty low ~70ppm IIRC) in Delvac that did the trick.
I recall that someone here (Patman???) once said that GTX and Syntec have the same/similar additive package, therefore TBN shuld not drop too much in such a mix.
I know that mixing is OK but would like to call upon the collective wisdom of the board to be sure.
Any points of view greatly appreciated.
LOVE THIS BOARD!
