Thread: Mixing engine oils?

That's what Penrite recommends no doubt of that but why would we trust Penrite more than other good brands... i've checked the top of best rated engine oils and Valvoline is first in most tops, see what they recommend Valvoline Recommended Oil & Lubricant Guide for your Vehicle , Castrol who is nr 5 recommends a Magnatec 5w30 A5 fully synth oil: http://applications.castrol.com/oils...td5-(1998-2005)... but if we go further we see that Shell recommends 15W40 oil Find the right oil | Shell Global

i've learned something along my life to not 100% trust the recommendation of those who are selling oils and better rely on own experience of scientific arguments... and from all the research i've made in the oil area(and i've spent many hours for that) my conclusion is that fully synth is better for MY Td5

anyway thanks everyone for this discussion cos i decided to go for the Valvoline SYNPOWER FULL SYNTHETIC 5W-40 next time as it will not trick my Lubricheck like Castrol might have

Hahaha top rated - Valvoline.

Yes, who would trust a well renown Aussie oil company, whose oil was used by the Castrol racing teams in rebranded 20l drums..

Who would trust a company that is liable for any damage proven to be from incorrect oil recommendation.

Who would trust a company that has certification approvals for many of its products (not just claiming compliance)

We moved 3 customers over from Valvoline - they now have smoother engines

So you tell me please a worldwide known brand other than Penrite(which is almost unknown in eastern Europe) which you trust and let's see what they recommend. ...it's not me who made the top ten's of oils and i didnt find Penrite in any of them... which doesnt mean it's not a brilliant oil but as long as they recommend a semy oil for a turbo diesel EUI engine i have my own doubts no offence.... also i haven't ever said the semy is not good or it will ruin the engine so no risk for Penrite on this... IMO it's a long way from an oil which will damage the engine to what's satisfactory or the best

Originally Posted by thai_tiger

just to confirm mobil 1 delvac esp 5 w 40 is not suited to the td5


thx

It's a lot more suitable than M1.

I used to use Delvac 1 and it was a brilliant oil. Took it to 20,000km in a Patrol TD42 regularly that was worked very hard (towing) and wear metals were better than Fuchs Titan 15W-40 at 5,000km, but this was well over a decade ago.

Personally, I'd make the choice between it or Penrite depending on availability and $ and it'd be fine.
Having said that the oil analyst doesn't rate the modern Mobil syns anywhere near where they were fifteen years ago, or to put it another way, there are better oils for extreme or tricky applications. In general use. or where they've worked closely with an engine manufacturer and certified an oil for an engine family they are fine.

I'm not trying to be a fan boy here, I'm only interested in what works, I have no brand loyalties but interestingly when an Aussie customer of the analyst i use has had a problem with a well regarded boutique oil he has them use Penrite and it usually sorts the problem. eg one very well known POE based oil was giving problems in a Chev (all indications were a bottling problem, dirt) so they used a Penrite blend as a control and the problem was solved and the results were very good.
The bloke I use is US based and he was surprised but happy, he's only interested in results, not names.

It hasn't always been this way.
Way back in another lifetime when I raced a competitor was Penrite sponsored and they had all sorts of problems with the oil, lots of foaming with the high G's of racing, and the engine was dry sumped.
This was well before Penrite made any synthetic oils, it was all high viscosity stuff.