Rick,
 
If it's only used on the street and the occasional trip in the country and it's a bog stock to medium warm L20B and/or it's a high mileage unit with worn valve guides but good seals then in my humble opinion you can't go past Castrol GTX (i.e. the original blend). GTX2, Valvoline XLD etc are OK but they thin out and break down in the second half of the change cycle. GTX will stay good up till around 80% cycle in a warn L series engine. If some of my conditions don't apply eg you hill climb or autox etc then you're looking at a different grade and quality of oil, probably a single grade would be more suitable eg Penrite 30. Synthetic oils are all that suitable for the L series, although some ppl have good results from Shell Helix.
 
Heath mentioned BP Coarse + - good oil that and also very suitable for the L20B, in fact it's one of the few "petrol vending company" type oil products I've ever used in 30+ years of motoring that's done the job to my satisfaction.
 
I just put a 910 Bluebird Series 1 & 2 L20B thru the Shell oil selector and this what came back:
 
 
NISSAN (Includ. DATSUN)
Bluebird 910 Series, B/W Aust. 4-Speed Man./Auto. (1981-1985)
 CRANKCASE
      Shell Helix Super
      Capacity 3.8 Litres (See Note 3)
 MANUAL TRANSMISSION
      Shell Helix Super
      Capacity 2.1 Litres
 AUTOMATIC TRANSMISSION
      Shell ATF Dexron III
      Capacity 7.3, 5.5 Litres (See Note 12)
 DIFFERENTIAL
      Shell Spirax AX 80W-90
      Capacity 1.1, 1.0 Litres (See Note 14)
 NOTES
    3 May also use HELIX PLUS.
    12 Dry fill capacity shown, fill only to full mark.
    14 May also use SPIRAX A 80W-90.
 
      � Copyright 2002, Datateck Publishing Pty Limited
 
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]On Behalf Of Rick Parker
Sent: Thursday, 27 March 2003 1:59 PM
To: [EMAIL PROTECTED]
Subject: L20b oil

What oil am i best off using in my L20b.
 
Cheers fellas

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