what kind of oil should i use for my 69 Porsche? i was told to get 25-50. is that correct if so what brand?
Thanks,
Hans
Printable View
what kind of oil should i use for my 69 Porsche? i was told to get 25-50. is that correct if so what brand?
Thanks,
Hans
20W-50 I have. Castrol or Motorex.
(Keep in mind to control oil level wile engine is actually running, car on horizontal stand).
"...In general, newer vehicles will specify lower viscosity oils such as 5W-30 while older vehicles will specify higher viscosity oils such as 20W-50. This is because today's engines are built with tighter bearing clearances to take advantage of the fuel economy benefits of lower viscosity oils. It is not really a good idea to use thicker oil in one of these engines because it will disrupt the oil flow characteristics of the engine and may create excessively high oil pressure.
In an older engine that was designed with larger bearing clearances, it is appropriate and recommended to use a thicker oil (i.e. 20W-50) to maintain proper oil pressure and provide adequate bearing film thickness. This is also true for engines that have a lot of miles on them and the oil pressure is starting to drop off. By using higher viscosity oil, you can boost the oil pressure back to normal levels and increase bearing film strength."
Read more: http://wiki.answers.com/Q/What_is_th...#ixzz15x7yyxgv
In the US, most use Brad Penn. The regulations mean that many oils that used to be good like Castrol GTX are now bad. Tehy do not have enough Zinc and Phosphorous anti-wear additives. GTX is just bad oil anyway since it has poor base stock and shears/thins out very quickly.
I use Brad Penn 20W50 (it is called racing oil).
http://forums.pelicanparts.com/porsc...4-sm-oils.html
Use a high quality 20W-50 oil. Some to consider: Valvoline VR-1, Brad Penn, and Kendall GT. My engine builder tell me to avoid Castrol as, while it starts out ok, it rapidly degrades in air cooled service.
Be very careful of what you use because, unlike the old days, oil IS NOT, oil.
Most important is ensuring that the oil you use has enough of the antiwear additives and decent detergent package to ensure you do not see premature wear on your cams and other parts subject to high pressures.
Sadly, oil is no longer just oil. Due to Government and car maker pressures, the newer oils are now being formulated to not only lubricate your engine but also be "energy efficient", protect catalytic converters and allow for extended oil change intervals. These changes have been made at the expense of some lubrication needs of older engine that result in reduced engine longetivity.
You can read the http://forums.pelicanparts.com/porsc...4-sm-oils.html to get the full story.
Cliff notes go like this:
Steve Weiner offers these thoughts:Quote:
Originally Posted by HarryD
Quote:
Originally Posted by Steve@Rennsport
+1 brad penn, just ordered 3 cases www.theoilwarehouse.com...even with expensive shipping, their prices were a bargain
You may wish to log onto this site
http://www.lnengineering.com/oil.html
and read the thorough and useful paper on currently available motor oils, which additives are important, etc., written by Dr. Charles Navarro ( principal, L & N Engineering, Naperville, IL ).
It should answer most of your questions.
JZG
S w e p c o
For "too much information", this is a fun, related thread:
http://forums.pelicanparts.com/porsc...4-sm-oils.html
Is anyone running full synthetic oil like Mobil 1 in an early car?
I've been using Amsoil 20W/50 for quite a few years. One of our local members is a rep. In my 73S on a hot day, oil temps 210deg I get much better oil pressure at idle than with Valvoline VR-1 dino oil. I also use Amsoil in my 64 Beetle. Porsche gets slight seepage at nose bearing, Beetle has a few more slight leaks, however, both did this also with Valvoline. I also believe oil temps down due to Amsoil.