Walter while synthetics are wonderful for some reason the really high output
engines such as raced by Joe Mondello (for instance his twister) still use
Dino racing oils. Got any idea why?
>That Consumers Union oil study was one of the main reasons I ended my
>subscription to the magazine, well that and the bread machine they
>recommended. Anyway, there seems to have been many flaws in the Consumer's
>test that makes it of little value (it was the most costly test they ever
>did too). The cabs did not go through start up and shut down cycles. Cold
>start I think we all agree is bad from a wear point of view. They ran the
>engines long periods, maybe days in fact without shutting down. This would
>allow the oil additive package to work at its best. Until the (dino) engine
>oil reaches 160 or so, the additive package is largely ineffective.
>Synethics work at their best at all temperatures. This shortcoming would not
>be apparent in their test. Consumers ended the test after 60,000 miles. Not
>enough mileage in my opinion. I have lots of experience with the Chevy
>small block (they used the 4.3L, which is a 350 [5.7L] with the 3&6
>cylinders missing). When built to specification, 60,000 would not cause the
>type of wear to accumulate to test the lubricating capacity of one oil to
>the next. I doubt the cab engines ever saw 3,500 rpm or heavy loading (I
>mean a large percentage of the rated max hp. The engine they used was
>probably only 165 hp, but in NYC street speeds, the engine rarely puts out
>more than a tiny fraction of this on average). GM small blocks are designed
>to run at or below 75% of their red line rpm rating. You go above this, you
>are putting real stress on things. Again, if the engines were run under
>more severe conditions of high load, high rpm, some oils might have proven
>better. Then there is the issue of sample size and the variation in the
>engines they used. Several failed during testing due to various causes not
>related to oil. I don't think Consumers' test showed anything, and
>definitely are not relevant to heavy duty operation like in a 12,000 lb RV.
>Maybe dino oil will work just as good as synthetics for some applications
>but I won't gamble with my engines, which I build myself, on anything less
>than Mobil-1; especially in the GMC. walter bright, 76 GB.
>
>
>-----Original Message-----
>From: Thomas G. Warner [mailto:warner]
>Sent: Tuesday, April 27, 1999 8:35 AM
>To: gmcmotorhome
>Subject: RE: GMC: Mobil 1 Thread
>
>
>NY taxi is about the most severe service that an engine will ever see. It
>is not the steady RPM that kills an engine like pulling 6 tons up a
>mountain, it is the stop and go and severe RPM changes that does it. Add the
>constant starting of the engines (waiting for fares) and you have a real
>killer for engines and trannys. The NY taxis run 24 hours a day 7 days a
>week and put tons of miles on them.
>
>
>>>
>>>
>>> Patrick,
>>> Re:mobil 1 and Consumers Report citing New York Cab study.
>>
>>> But I question Consumer Reports methods.These cab fleets
>>> use a hours in use or days in use maintance for oil changes.
>>
>>One might also beg to differ that NY Taxi service ain't exactly "severe
>>service" when compared to a 455 pulling six tons of motorhome up the
>>Rockies, eh?
>>
>>Patrick
>>
>>
>Tom & Marg Warner
>Vernon Center NY
>1976 palmbeach
>"The beautiful Mohawk Vally"
>
>
Tom & Marg Warner
Vernon Center NY
1976 palmbeach
"The beautiful Mohawk Vally"
engines such as raced by Joe Mondello (for instance his twister) still use
Dino racing oils. Got any idea why?
>That Consumers Union oil study was one of the main reasons I ended my
>subscription to the magazine, well that and the bread machine they
>recommended. Anyway, there seems to have been many flaws in the Consumer's
>test that makes it of little value (it was the most costly test they ever
>did too). The cabs did not go through start up and shut down cycles. Cold
>start I think we all agree is bad from a wear point of view. They ran the
>engines long periods, maybe days in fact without shutting down. This would
>allow the oil additive package to work at its best. Until the (dino) engine
>oil reaches 160 or so, the additive package is largely ineffective.
>Synethics work at their best at all temperatures. This shortcoming would not
>be apparent in their test. Consumers ended the test after 60,000 miles. Not
>enough mileage in my opinion. I have lots of experience with the Chevy
>small block (they used the 4.3L, which is a 350 [5.7L] with the 3&6
>cylinders missing). When built to specification, 60,000 would not cause the
>type of wear to accumulate to test the lubricating capacity of one oil to
>the next. I doubt the cab engines ever saw 3,500 rpm or heavy loading (I
>mean a large percentage of the rated max hp. The engine they used was
>probably only 165 hp, but in NYC street speeds, the engine rarely puts out
>more than a tiny fraction of this on average). GM small blocks are designed
>to run at or below 75% of their red line rpm rating. You go above this, you
>are putting real stress on things. Again, if the engines were run under
>more severe conditions of high load, high rpm, some oils might have proven
>better. Then there is the issue of sample size and the variation in the
>engines they used. Several failed during testing due to various causes not
>related to oil. I don't think Consumers' test showed anything, and
>definitely are not relevant to heavy duty operation like in a 12,000 lb RV.
>Maybe dino oil will work just as good as synthetics for some applications
>but I won't gamble with my engines, which I build myself, on anything less
>than Mobil-1; especially in the GMC. walter bright, 76 GB.
>
>
>-----Original Message-----
>From: Thomas G. Warner [mailto:warner]
>Sent: Tuesday, April 27, 1999 8:35 AM
>To: gmcmotorhome
>Subject: RE: GMC: Mobil 1 Thread
>
>
>NY taxi is about the most severe service that an engine will ever see. It
>is not the steady RPM that kills an engine like pulling 6 tons up a
>mountain, it is the stop and go and severe RPM changes that does it. Add the
>constant starting of the engines (waiting for fares) and you have a real
>killer for engines and trannys. The NY taxis run 24 hours a day 7 days a
>week and put tons of miles on them.
>
>
>>>
>>>
>>> Patrick,
>>> Re:mobil 1 and Consumers Report citing New York Cab study.
>>
>>> But I question Consumer Reports methods.These cab fleets
>>> use a hours in use or days in use maintance for oil changes.
>>
>>One might also beg to differ that NY Taxi service ain't exactly "severe
>>service" when compared to a 455 pulling six tons of motorhome up the
>>Rockies, eh?
>>
>>Patrick
>>
>>
>Tom & Marg Warner
>Vernon Center NY
>1976 palmbeach
>"The beautiful Mohawk Vally"
>
>
Tom & Marg Warner
Vernon Center NY
1976 palmbeach
"The beautiful Mohawk Vally"
