[xk-engine] Recommended oil for the XK engine?

What is the consensus on the Forum as to what viscosity oil to
use? I have recently rebuilt my XK motor; the only thing I did
not do is rebore it and fit new pistons, other than that every
thing is new internally.

I checked with Castrol but they don’t go back to 1960 when my Mk 2
was built. However for 1970 and on, they have a wide variety of
recommended viscosities, ranging from 10-40 to 20-50. I live in
Southern California so temp extremes are not much of an issue. I
am thinking of going with 20-50. Any thoughts?

Cheers,
Tom–
302Rover
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–

//please trim quoted text to context only

I think the consensus is that Castrol GTX 20W-50 is a good modern oil to
use.

Mike Eck
New Jersey, USA
www.jaguarclock.com
'51 XK120 OTS, '62 3.8 MK2 MOD, '72 SIII E-Type 2+2

//please trim quoted text to context only

In reply to a message from Mike Eck sent Wed 2 Jul 2008:

Thanks Mike, that is what I always used in my Rover 2000 and
suspected that it would be good for the Jag motor as well.

Tom–
The original message included these comments:

I think the consensus is that Castrol GTX 20W-50 is a good modern oil to
use.
Mike Eck


302Rover
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
–Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php

//please trim quoted text to context only

I don’t think Jag engines are oil fussy. Many owners use Castrol, yes.
Speaking for myself, when I use it I reckon it more for sentimental reasons
as much as anything else. Castrol and Brit cars just seem to go together.
Its not like anything bad happens if you go to Mobil, or Valvoline, or Shell
:slight_smile:

Doug Dwyer
Longview Washington USA
1995 XJR
1990 T-Bird SC

Thanks Mike, that is what I always used in my Rover 2000 and
suspected that it would be good for the Jag motor as well.

The original message included these comments:

I think the consensus is that Castrol GTX 20W-50 is a good modern oil to
use.

//please trim quoted text to context onlyFrom: “302Rover” v8rover@earthlink.net

In reply to a message from 302Rover sent Wed 2 Jul 2008:

When I had my 120 back in the day I ran straight 40 weight. The 62
E-Type I ran whatever used or reclaimed oil I could buy by the
gallon and two or three cans of STP, even then it burned a qt every
3-400 miles, and in the 67 E-Type I only used 50 weight Castrol
racing oil.
My mechanic, Bill at Britallia in Buena Park, then Fullerton, who
specialzed in Jags and Aston Martins, told me the XK engines were
designed with iron rings to burn some oil, to only use straight 40
or 50 weight oil, and that using a qt every 1500-2000 miles was
perfectly normal even desirable. Of course back then multi-weight
oils were less common. He also told me to only run leadfree Chevron
Custom Supreme 104 octane…

Lee Murray–
The original message included these comments:

What is the consensus on the Forum as to what viscosity oil to
use? I have recently rebuilt my XK motor; the only thing I did
not do is rebore it and fit new pistons, other than that every
thing is new internally.
I checked with Castrol but they don’t go back to 1960 when my Mk 2
was built. However for 1970 and on, they have a wide variety of
recommended viscosities, ranging from 10-40 to 20-50. I live in
Southern California so temp extremes are not much of an issue. I
am thinking of going with 20-50. Any thoughts?


Lee Murray '95 XJS 4.0 Convertible '96 XJ6
Sherburne, NY, United States
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
–Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php

//please trim quoted text to context only

I just go with 20W/50, of any brand. If oil burning is annoying, then add
some STP. Our SII needs that touch, but likely due to intake-valve seals,
which I’ve yet to get to.–
Alex
79xj6L SII (BRG + wires)
86xj6 SIII (Black)
61 Sprite MkII (Red)
Menlo Park, Calif.

LeRoy Murray wrote:

In reply to a message from 302Rover sent Wed 2 Jul 2008:

When I had my 120 back in the day I ran straight 40 weight. The 62
E-Type I ran whatever used or reclaimed oil I could buy by the
gallon and two or three cans of STP, even then it burned a qt every
3-400 miles, and in the 67 E-Type I only used 50 weight Castrol
racing oil.
My mechanic, Bill at Britallia in Buena Park, then Fullerton, who
specialzed in Jags and Aston Martins, told me the XK engines were
designed with iron rings to burn some oil, to only use straight 40
or 50 weight oil, and that using a qt every 1500-2000 miles was
perfectly normal even desirable. Of course back then multi-weight
oils were less common. He also told me to only run leadfree Chevron
Custom Supreme 104 octane…

//please trim quoted text to context only

In reply to a message from A. Cannara sent Tue 8 Jul 2008:

The only oil I put in my XK’s is Shell Rotella. They have
removed almost all ZDDP additive that is needed in our
flat-tappet cams. My engine rebuilder has seen many cam
failures with the use on current motor oil. The below link
will describe it far better than I can.

http://www.hotrod.com/techarticles/engine/flat_tappet_cam_tech/index.html--
Mike, 58 XK150 OTS, 66 XKE OTS Wisconsin
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
–Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php

//please trim quoted text to context only

But does it really matter for XKs, given what that site says about flat
tappets wearing in “vehicles running nonstock, performancecams and valvetrains”?–
Alex
79xj6L SII (BRG + wires)
86xj6 SIII (Black)
61 Sprite MkII (Red)
Menlo Park, Calif.

J.Michael Tendick wrote:

In reply to a message from A. Cannara sent Tue 8 Jul 2008:

The only oil I put in my XK’s is Shell Rotella. They have
removed almost all ZDDP additive that is needed in our
flat-tappet cams. My engine rebuilder has seen many cam
failures with the use on current motor oil. The below link
will describe it far better than I can.

http://www.hotrod.com/techarticles/engine/flat_tappet_cam_tech/index.html

//please trim quoted text to context only

In reply to a message from A. Cannara sent Mon 14 Jul 2008:

Yes it does. It applies to all flat-tappet cams stock or
modified. If you Google ‘‘ZDDP motor oil’’ you will find many
supporting articles.

All Jaguar XK engines have flat-tappet cams.–
The original message included these comments:

But does it really matter for XKs, given what that site says about flat
tappets wearing in ‘‘vehicles running nonstock, performancecams and valvetrains’’?


Mike, 58 XK150 OTS, 66 XKE OTS Wisconsin
–Posted using Jag-lovers JagFORUM [forums.jag-lovers.org]–
–Support Jag-lovers - Donate at http://www.jag-lovers.org/donate04.php

//please trim quoted text to context only