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Discussion Starter #1 (Edited)
Newbie w/12,500 miles on used RKC. First oil changes for me. Decided on Mobile 1, 20W50 for engine but unsure what to use for primary and trans. Manual suggests HD oils but does not give me a oil weight spec. Prefer syn oil. Suggestions appreciated.
 

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dmeals said:
Newbie w/12,500 miles on used RKC. First oil changes for me. Decided on Mobile 1, 20W50 for engine but unsure what to use for primary and trans. Manual suggests HD oils but does not give me a oil weight spec. Prefer syn oil. Suggestions appreciated.

Redline all the way here and VERY pleased
- 20W60HD in crankcase
- MTL in primary
- Heavy Shockproof in trans

Purchased several cases (my son and his buddies also have Harleys) from
www.myoilshop.com - good prices and very fast delivery.

Flame on.....
:sofa:
 

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If you want to go synthetic, use Mobil 1 Synthetic Gear Lube 75W/90 in the transmission, and Mobil 1 MX4T in the primary.
 
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