I recently purchased a 1987 Porsche 944s (16V 2.5L 4cyl water cooled). I looked through my stash to find a suitable oil. The top two contenders are Syntec 5W40 and Valvoline Synpower 5W40. Both say Porsche approved but only the Syntec is listed on the Porsche approved list.
Syntec lists GM-LL-B-025, VW 502.00, 505.00, ACEA: A3/B3, A3/B4, MB 229.3, BMW LL-98
Synpower lists VW 502/505/505.01, ACEA: A3/B3/B4/C3, MB 229.3/229.31/229.5/229.51, BMW LL-04
I also have some GC but it's not on the Porsche approved list and nearly all are either 0W40 or 5W40.
I live near Toronto, Canada, a fairly mild climate. Which would you use?
Syntec lists GM-LL-B-025, VW 502.00, 505.00, ACEA: A3/B3, A3/B4, MB 229.3, BMW LL-98
Synpower lists VW 502/505/505.01, ACEA: A3/B3/B4/C3, MB 229.3/229.31/229.5/229.51, BMW LL-04
I also have some GC but it's not on the Porsche approved list and nearly all are either 0W40 or 5W40.
I live near Toronto, Canada, a fairly mild climate. Which would you use?