In a message dated 10/31/2006 8:43:54 P.M. Eastern Standard Time,=20 ALVentures@cox.net writes:

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I talked to a= guy a=20 Mazdatrix who sells the Idemitsu, and one of his comments was that they= =E2=80=99ve had=20 good luck with the Castrol. Maybe I=E2=80=99ll stick with it and cha= nge more=20 often; I can change it about 5 times for the cost of one change with the=20 Idemitsu. Besides; I always have some around because I=E2=80=99ve us= ed it all my=20 other vehicles for years with exceptionally good results.

The Jap oil is probably every bit as good as they claim it is.

As far as oil goes, the bearings are huge compared to the loads=20 involved. That is one reason that you can overheat the oil repeatedly and ge= t=20 away with it. I have lost 4 rotor bearings since 1980. In the first cas= e=20 (Valvolene 40 weight racing) the radiator got a chunk of tack through it=20 and we lost all of the coolant. The engine finished the race (it=20 happened close to the end) and then could not be shut off. With the battery=20 disconnected and the ignition switch off I had the driver select 4th gear an= d=20 release the clutch while holding the brakes. The engine stopped, never to tu= rn=20 over again. The distributors and front cover were fine. The rest was sc= rap=20 metal.

Oil brand not a factor.

Not to long ago, maybe 7 years, we bought two real racing engines from=20= the=20 top builder for our kind of racing. One complete for $14,000.00 and an ident= ical=20 short engine for $7,000.00.

I installed the complete engine and went to Mid Ohio. Lost the front ro= tor=20 bearing housing and front iron (broke the bridge) in the first practice sess= ion=20 at about 7,000 RPM, right in front of me. Not even on the power, just warmin= g it=20 up. The following week at Gingerman we lost the backup engine in the first=20 qualifying session. Lost the rear rotor, housing, and rear iron (broke the=20 bridge).

Mazda had changed suppliers for bearings and not said anything about it= .=20 The new bearings were junk. Thank you very much Mazda. Both were on Redline=20= 40=20 weight racing oil. Not overheated.

Oil brand not a factor.

Castrol invented multi weight oil. Just fine in the crank case. A=20= high=20 quality 2 cycle oil for the OPM would be better. Plus you can run longer bet= ween=20 changes because it is a street oil with the correct additives for acid=20 control.

The heavy weight oil is right by the door there. The medium weight oil=20= is=20 behind the counter.

The light weight oil is beside the Franklin stove.

Lynn E. Hanover

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