We could argue the point back and forth ad infinitum. You're right that it doesn't need more oil to function. I don't insist that it does, but I do insist that it is a good idea. There are two ways to look at it.... you can increase the oil demand and hope that supply stays within acceptable limits. That will be fine.... right up to the point that it isn't. The second option is to implement the same engineering that Mercedes already put into its engines with higher oil demands by replacing two parts that are easily accessible during the upcoming repairs. Honestly if he weren't already pulling the timing cover I wouldn't have even suggested it as it is a good bit of labor to just go in after the gear alone. There is no more power to be had and probably there will be a little more parasitic pumping losses. But this isn't about 1/2 hp @6000RPM, it is about your margin of safety. The 103 is a well built motor as is and can take a lot of punishment. However when you start getting near to double it's rated output do you want to be on the low side of that margin of safety or on the high side?

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff