unless we are running flat 6 porsche engines or other engines which have Bronze Valve Guides, Powder Metal Valve Seats (like steel), stainless steel valves, EGR's and catalytic converters the above link & post do not apply. most SL & SM oils are designed to run in conjunction with fuels with high sulphur and phosphorous content, which is the exact fuel we have in PK. the oils i was discussing above ceom with additives which help them perform in such environments. there is a reason porsche switched to sodium filled valves, the dissipate heat better. also i should point out that porsche had 2 types of cylinder manufacturers, one was mahle (Nikasil) and the other was Kolbenschmitt (Alusil), believe it or not lubricating requirements were different depending on which one was used in the vehicle. Valves on porsches tend to develop hot spots and can also crack due to seat and valves not meeting and mounting correctly. this is another reason why aircooled engines require the best possible oil & cooling system. it's always a gamble when talking about high performance aircooled engines as there is always a tradeoff.
anyhow, getting back to the point:
Numerous additives have been tried in lubricant formulations in order to reduce friction between various moving parts and reduce engine wear. Such additives include organo-molybdenum and organo-zinc phosphate additives. These additives are particularly useful as friction & wear reduction modifiers, such additives, however may have 1 or more of the following disadvantages: copper and/or lead corrosion, poor solubility of the oil, darkening of the finished product and increased levels of sulfur and/or phosphorus in the finished product.
Therefore, a need exists for oil additives & compositions that provide enhanced friction & wear reducing properties & which are also more compatible with pollution control devices used for automotive and diesel engines abroad. This is again not the case in PK as we do not have catalytic converters of EGRs in most of our vehicles.
However, if we are still talking about porsche engines, hydrocarbon soluble organo-titanium compounds are believed to be useful for reducing the amount of organo-zinc &/or molybdenum compounds used in oil formulations while achieving similar or improved results without adversely affecting pollution control devices on these engines.
@all
if you have a flat6 porsche, and can find Motul or Swepco oil in PK,.. please use it, ahsanzs has made a valid point regarding these engines and his advice should be followed. Also you should read the link he provided as it offers some great info on engines, oils and wear.
