10-30 is a little too thin and oil pressure a little low
#1
10-30 is a little too thin and oil pressure a little low
I am thinking about going 10-40 but what about 20-50?
Also, should I add ZDDP in a rebuilt engine or is that only needed for an orig. motor?
Thanks.
I have searched a bit on the forum but still have these Q's from what I have read.
Also, should I add ZDDP in a rebuilt engine or is that only needed for an orig. motor?
Thanks.
I have searched a bit on the forum but still have these Q's from what I have read.
#4
The older engines had a lot looser tolerances than modern engines do.
20W50 may sound heavy by today's standards, but not by engine standards of the 60's & 70's.
In all my older performance Mustangs I ran 20W50 Castrol GTX.
I had a high perf Trans Am (450hp). When I drove to work (90 miles) the oil pressure on my mechanical gage would gradually drop down to around 20psi.
I tried several different oils and they all did this until I tried the Castrol GTX. The Castrol oil never thinned out, never lost viscosity due to heat and never lost a single PSI the whole trip.
Castrol GTX in my opinion is the best oil for a 60's mustangs up through the Fox body 302s.
Note: The newer OHC engines are another story, the heavier weight oils are usually not a good idea with those.
20W50 may sound heavy by today's standards, but not by engine standards of the 60's & 70's.
In all my older performance Mustangs I ran 20W50 Castrol GTX.
I had a high perf Trans Am (450hp). When I drove to work (90 miles) the oil pressure on my mechanical gage would gradually drop down to around 20psi.
I tried several different oils and they all did this until I tried the Castrol GTX. The Castrol oil never thinned out, never lost viscosity due to heat and never lost a single PSI the whole trip.
Castrol GTX in my opinion is the best oil for a 60's mustangs up through the Fox body 302s.
Note: The newer OHC engines are another story, the heavier weight oils are usually not a good idea with those.
Last edited by Old Mustanger; 05-27-2012 at 12:00 PM.
#5
The older engines had a lot looser tolerances than modern engines do.
20W50 may sound heavy by today's standards, but not by engine standards of the 60's & 70's.
In all my older performance Mustangs I ran 20W50 Castrol GTX.
I had a high perf Trans Am (450hp). When I drove to work (90 miles) the oil pressure on my mechanical gage would gradually drop down to around 20psi.
I tried several different oils and they all did this until I tried the Castrol GTX. The Castrol oil never thinned out, never lost viscosity due to heat and never lost a single PSI the whole trip.
Castrol GTX in my opinion is the best oil for a 60's mustangs up through the Fox body 302s.
20W50 may sound heavy by today's standards, but not by engine standards of the 60's & 70's.
In all my older performance Mustangs I ran 20W50 Castrol GTX.
I had a high perf Trans Am (450hp). When I drove to work (90 miles) the oil pressure on my mechanical gage would gradually drop down to around 20psi.
I tried several different oils and they all did this until I tried the Castrol GTX. The Castrol oil never thinned out, never lost viscosity due to heat and never lost a single PSI the whole trip.
Castrol GTX in my opinion is the best oil for a 60's mustangs up through the Fox body 302s.
#6
I had a 71 Pont. GT37, 400, 4 sp. Always ran Castrol 20/50GTX. Too many Sat. night races to even remember. At 190,00 miles I sold it, and had never touched the motor. (unless you count the blown up clutch). For some reason I quit using it with later cars. This reminder may make me re-think that.