Thanks Phil, I value your insights and experience.

Then, at cold idle, my car are up to 20 psi over the usual pressure (at hot idle is on normal range)...ummh..could be a clogged oil way on some part... after buy rojo (my car) I get a lot of debris after a cleaning of oil ducts, and probably some leave in. Not so critical to open the engine right now, but to be on mind on next engine can open.

Also, 20W-50 oil is more than adequate for my old rojo.

I ve in mind another probably source of maladies: the engine head, it could be need some work due I use here 97 RON gas unleaded - no more leaded gas available, except a salad 84 RON for buggies. Due it the valves would be need a seat insert and guide change (probably soon). It can be related with low compression values (225, 225, 225, 220 - same values with oil trick) on my engine. The head is not rebuilted (up today) due I remain seeking here for a experienced small factory to made the job (good machinists here are very rare).

Also, a friend of mine (he have a Mustang) talk me about the advantage of diesel oils on our old engines...¿do you know if him was right or I need to present him with a copy of a 60's texaco oil ad?.

Thanks for your kindly answers,

Joaquin