Saturday, Feb 07, 2009 at 22:18
Brian - That troopy is a credit to you - obviously alot of work went into it!
I would be tempted to keep a few used oil samples - and have them analysed by westrac equip etc here in
Perth.
I foumd with both the Tdiesels that I added LPG injection too - that my oil sampoles were oxidising faster than normal - also high levels of nitration, and sulphation is an issue!
It appears that - like LPG engined forklifts, these LPG diesel engines seem to need a oil higher in sulphated ash content, compared to just straight diesels!
They also need high calcium levels in the oil add pack
A lot (nearly all) Oil manufacturers are switching away from Calcium in their add packs to counteract acids formed in combustion that blow by into the sump oil, and replacing it with magnesium based compunds as their "base" instead!
One of the problems with SOME of the earlier Japanese diesels is that they run their oil at above the
breakdown heat for the magnesium compounds in the oil, and it burns off and therefore diesnt counteract the acids formed during combustion.
Likely this wn't be an issue for you with a USA build Chev engine - BUT asyou know these Chevs have a reputation for running on the warm side!
Some of the worst offending oils seem to be the fully synthetic & even synthetic blends!
Apparently the magnesium is a LOT easier on the catalytic converters - hence the reason manufacturers are phasing out the Calcium base in their add packs.
If it were me and you have to use the new oils with Magnesium - I wouldn't be trying for extended oil change intervals!
The oils viscosity / lubricity is probably OK to go longer than 5000 km's betweenm changes but you could end up with corrosion from excess acid in the oil IMHO if you try the 10,000, 15000 or 20,000KM extended oil change intervals!
Your Used Oil Analysis will help you out to know just exactly how she is faring at any given time!
Cheers and keep us posted how she goes!
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Follow Up By: Red Tail Black (WA) - Saturday, Feb 07, 2009 at 23:17
Saturday, Feb 07, 2009 at 23:17
Thanks Flywest,
Great information will certainly keep an I on it. I'm not one for missing oil changes and only use what I believe is good oil.
Due for my 1st service at Brunswick will follow this up with them. Only got the running in oil in at the moment.
Thanks once again great info.
Cheers Brian
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