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It's hard to imagine the brand of bulbs could make a difference. At any rate, I'm not an EE, so who knows? I do have a few "off brand" bulbs in there. But, in my case, they were in there for some time (as in years) with cruise control working fine. From those who claim bulbs make a difference, my impression is that the malfunction woudl be immediate and consistent.
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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 160k miles
06 E320 CDI "Rutherford", Black on Tan, 180k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete
19 Honda CR-V EX 79k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife
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