Hi Clive,
The Toyota literature is wrong, but there is a reason for it, you can
substitute 0W30 or 5W30 in place of 10W30 as it is the 30 part that
determines the suitability of the oil once it is warmed up the 0 or 5
part relates to the bottom temp you can start in. The reason Toyota on
there diesels does not reccommend 5W30 for sustained use in anything but
quite cold condtions is to do with the quality of typical oil base
stocks used in Japan. They are very volatile in europe most grades of
oil are illeagal for sale if they have a NOACK volatility of over 13%
(basically a beaker of oil is heated to 250?C and a very mild vaccuum
applied to it and left to cook for one hour the loss of oil is measured
as a percentage of mass lost in that time and that is the NOACK
volatility for that oil). Most OEM oils in japan have a volatility of
12-17% so the loss of oil due to boil off in the thinner grades can be
quite high.
As a comparison the 0W30 I reccomended has a volatility of 8.6% a pour
point of -54?C and a borderline pumping temp of -40?C (so if you are
going to be starting in temps below -40 then a sump and or block heater
might be a good idea.
A chepaer alternative is Amsoils ASL 5W30 with a noack of 6.6% and a
pour point of -60 but the 0W30 is there super premium high perfomance
low viscosity oil.
Cheers,
Craig.
Neill Watson wrote:
>On 25/12/06 6:15 am, "Clive Marks" wrote:
>
>
>
>>Neill,
>>
>> I have read in Toyota literature somewhere not to use oil below
>>10w 30 if you have a turbo fitted. When I went to Russia I threw out 2
>>Gallons of 5w 30 as I did not find out before buying it.
>>
>> Regards, Clive.
>>
>>
>
>
>Thanks, Clive, but it's the 24 valve petrol engine, so no worries there.
>
>Craig in NZ emailed me off list suggesting Amsoil 0W30, but not sure where
>I'll get it in the UK.
>
>Neill W
>
>
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