On the subject of Stew

My thoughts, also.

Only two things hold the world together... bailing wire and oil tar ;-)

...Jim Thompson

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ahem ... oh, them pesky kids!

Best of Luck - Mike 61/2

Its too bad that we can't make oil out of Usenet trolls and stuffed donkeys with keyboards. At least that way they could finally do something useful for the world.

On Fri, 15 Sep 2006 20:38:04 GMT, "ian field" blethered:

Indeedy.

US made canned chilli likewise.

Canned cilli is supposed to look like a pile of sick!!!

The vast majority of small motorcycle engines (4-stroke) are "unit construction" which means that the sump oil also lubricates the gear train, the thrashing in the oil is almost like an ultrasonic cleaning tank! Most of these engines I've opened had very little sludge, the smaller engines (like the one in question) which use needle roller instead of shell big end bearings usually have a centrifugal sludge trap instead of a paper filter - and I cleaned this out before I put the bike into service.

The fact is that unit construction engines are harder on the oil than ones where the sump oil is not subjected to the high shear stresses in the gear train, and this is reflected by the surprisingly short oil change period stated in the workshop manual - of only 1500 miles!

Castrol might be good enough for some old fart to pootle down the shops once a week, but it clearly isn't man enough for the job where motorcycle engines are concerned!!!

I would suspect it is the cheap oil was 'thicker' than the expensive oil. The expensive oils take cheap, thin, low viscosity oils, and then add 'thickening' agents that are supposed to 'thicken' it was temperatures increase. I bet the cheap oil was just thicker in the first place. He probably needed to use something like 20W50 oil instead of 10W30 if you use the expensive stuff!

Charlie

Both the Halfords and the Castrol oils in question were the 10/40 grade sold for diesel engines, by coincidence the viscosity rating is exactly correct for that particular motorcycle engine, both oils claim to offer increased protection against the high shear loads in diesel engines - the cheap own brand Halford oil delivered on the promise and the expensive brand Castrol didn't, its as simple as that!

I once came across some *Silkolene* motor oil in Halfords. Pure synthetic. Was that good or what ? The engine was noticeably quieter for it.

Silkolene made the lubricant for the Concorde engines btw !

Graham

"Eeyore" wrote in message news: snipped-for-privacy@REMOVETHIS.hotmail.com...

Is that the one with added graphite?