The single most important factor for a long engine life is the choice of the two-stroke oil. We have been using Castrol products for over 10 years in our engines and our experiences are as follows:
We recommend the synthetic oils SCOOTING and STX for all standard to mildly tuned engines. These oils significantly reduce 'smoking' of the engine, they hardly cause any carbon deposits on head, piston and sparkplug at all. RS2 is a fully synthetic oil designed to meet highest standards. It is extremely heat resistant with outstanding lubricating characteristics. Recommended for all heavily tuned engines. Please keep in mind that fully synthetic lubricants usually are not burned completely - this causes fairly rapid blockage of catalytic converters and it leads to the characteristic 'oil-dripping' of race exhausts.
Castrol Power Racing 2T