Re: Pennzoil Bad?
Not sure what that means

Pennzoil is marked TC-W3 rated like the other "name brands" --
If your saying its inferior please say why?
The TC-W3 certification is a minimum performance standard. The certification does not quantity performance or the quality of a given oil. Only that it passes a set of minimum performance tests develop by the certification company.
Problems I have with the TCW certification program in general:
Why no testing of larger HP motor? If it?s important to test 15hp, 40hp and 70hp why not require testing for 100hp, 150hp and 225hp as well? If the oil meets the requirements of a 15hp does that mean that it will also meet the needs of my 200hp? If so, why bother testing 40hp and 70hp motors?
Most test criteria are ?no more or no less" than the reference oil? Obviously the reference oil is the standard but what does those standards represent? Why not give quantitative figures?
Under this process the oil suppliers don?t have to compete on performance standards. They can push it under the rug by saying the oil was certified to meet a set propriety standards. Who does this certification really benefit? If certification is in the customer best interest why are the details of the test results not available to the public?
The only quantitative standards I found in those documents are these.
Does anyone other than myself think that loosing 19 psi in 100 hours of usage or 20% total area scuffing an unacceptable performance standard?
Why is it that some of best performing oils on the market are not TCW approved?
5.4 NMMA TC-W3? Mercury 15hp Detergency Test
Pass Fail Criteria: To be considered acceptable for certification in TC-W3?, a candidate oil must pass the following criteria:
1) Compression Loss: No cylinder compression loss of equal to or greater than 20 psi is allowed within the 100 hours of test operation, including the 100 hour compression check.
2) Reported piston scuffing, scoring or wiping may not exceed 15% circumferentially on each side of the pistons.
3) Reported piston scuffing, scoring or wiping may not exceed 20% ?total area coverage? per piston side.
4) Reported ring wiping may not exceed 5% of the circumference of the ring face of any ring.