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Oil advice and Recommendation

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malllywoods View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote malllywoods Quote  Post ReplyReply Direct Link To This Post Posted: 16 Jul 2021 at 14:24
hello there, I am a bit puzzled as my 750T 1992 gearbox require a 85w/140  I put the details of my bike onto your website. I had to call it a Nevada as mine isn't on your dropdown list, but It is the same. You are recommending Castrol Transmax universal LL 75W fully synthetic transmission oil, a far cry from the original, Please can you confirm this will be ok as I do not want rubber seal problems at a later date or any damage.
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oilman View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote oilman Quote  Post ReplyReply Direct Link To This Post Posted: 16 Jul 2021 at 16:05
Hi

I've had a look and our site is recommending the Castrol Transmax Longlife LL 75w-90, which is 75w-90 and not 75w. I've also had a look at a few databases, and they are all listing 80w-90 as the standard option for that gearbox, so I assume that at some point after the bike was made, Guzzi changed the recommendation to 80w-90. We list 75w-90 instead as 75w-90 tends to be a better quality oil, as well as the thinner cold viscosity often helps to improve cold gear changes.

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Tim


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Brian UK View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 16 Jul 2021 at 18:57
There is also often confusion between the gearbox and bevel drive, which is called the transmission.
The bevel drive usually has the higher viscosity oil.
Brian.

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Superexcellent View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Superexcellent Quote  Post ReplyReply Direct Link To This Post Posted: 24 Jul 2021 at 22:56
I have just changed all the oils on my V50 II. I used Castrol Power 1 20W/50 for the engine, Castrol Syntrans 75W/90 for the gearbox and Castrol Syntrans 75W/140 for the bevel drive. I hope these are ok. I like fully synthetic oils and they are certainly better than mineral oils in my MX5
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Stevex View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Stevex Quote  Post ReplyReply Direct Link To This Post Posted: 24 Jul 2021 at 23:21
I don't use full synth oils in my LM2 of similar vintage to the V50II. You may find that the seals don't take kindly to it. I use Valvoline VR1 Racing in my engine. Apparently the Racing moniker allows them to use higher ZDDP content, which these engines like.
Power 1 is a semi, I believe, Power 1 Racing is the full synth.
Steve
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 25 Jul 2021 at 07:48
How do you judge that any oil is "better" for any particular engine? I guarantee you can't tell while riding/driving, and most don't keep vehicles long enough to know about long term differences.

Yes, synthetic oils are known to weep from older oil seals, where a mineral oil will not. If you do want to use any synthetic oil in an older engine it would pay to replace all the oil seals first.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote BobV7 Quote  Post ReplyReply Direct Link To This Post Posted: 25 Jul 2021 at 08:07
Originally posted by Brian UK Brian UK wrote:

How do you judge that any oil is "better" for any particular engine? I guarantee you can't tell while riding/driving, and most don't keep vehicles long enough to know about long term differences.

Yes, synthetic oils are known to weep from older oil seals, where a mineral oil will not. If you do want to use any synthetic oil in an older engine it would pay to replace all the oil seals first.

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Stevex View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Stevex Quote  Post ReplyReply Direct Link To This Post Posted: 25 Jul 2021 at 18:09
Originally posted by Brian UK Brian UK wrote:

How do you judge that any oil is "better" for any particular engine? I guarantee you can't tell while riding/driving, and most don't keep vehicles long enough to know about long term differences.

Yes, synthetic oils are known to weep from older oil seals, where a mineral oil will not. If you do want to use any synthetic oil in an older engine it would pay to replace all the oil seals first.

"Better", where did that come from? More suitable, definitely.
Which is why I wouldn't use a full synth oil in an old Guzzi engine.

Steve
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Brian UK View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brian UK Quote  Post ReplyReply Direct Link To This Post Posted: 25 Jul 2021 at 21:49
If you look at Superexcellent's post, you will se the word "better" was used.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote AdrianW Quote  Post ReplyReply Direct Link To This Post Posted: 16 hours 31 minutes ago at 11:59
Dear All,
Looking for gearbox oil for my 1982 V35II..  Probably prefer mineral to synthetic in case of seal problems..

Opie oils stock Fuchs Titan and Miller  80W/90. Others stock Comma , own brands, Castrol, Motul etc..

Any recommendations please?

Thanks,
Adrian
Bristol UK
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